What is self fertilization?

After the meiosis II of the cell cycle, the chromosomes in the secondary oocyte gets transferred to the polar body II and 23 chromosomes will remain in the mature egg.

Meiosis is basically a reductional type of cell division. In meiosis, the chromosomes present in the cell are divided equally amongst the two daughter cells which are produced from the parent cell. The meiosis is very important during sexual reproduction as it allows the formation of haploid germ cells.

After meiosis II, when the parent cell is divided into two gametes each gamete cell contains 23 chromosomes. In this phase, the gamete produced remains haploid in nature. At the end of the meiosis II, half of the chromosomes will remain in the egg and the rest half will be transferred to the polar body and therefore the cell will have half the number of the actual chromosome, that is, 23 chromosomes.

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A) In contrast to the convergence of up to 100 rod photoreceptors into a single ganglion cell, a single cone photoreceptor frequently connects to a single bipolar cell and a single ganglion cell.

Rods and cones are the two categories of photoreceptors that are involved in sight. Rods function in extremely dim lighting. Because just a small number of light particles (photons) may trigger a rod, we employ these for night vision. Because rods hinder color vision, we experience a grayscale world at night.

The three cone types are activated in varied combinations to produce color perception. Compared to night vision, color vision has far higher resolution (vision that is mostly in shades of gray).

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Answer:

The effects of extreme weather include, but are not limited to: Too much rain (heavy downpours), causing floods and landslides. Too much heat and no rain (heatwave) cause droughts and wildfires. Strong winds, such as hurricanes and tornadoes, cause damage to man-made structures and animal habitats.

Explanation:

Human activity is causing rapid changes to our global climate that are contributing to extreme weather conditions.

Answer:

the number of biomes present

It is true that "Some naturally occurring elements are toxic to organisms" as not all the elements found in nature are necessarily beneficial to all organisms.

The correct option is option B.

All the living organisms present on Earth are obtain their nutrition from the environment. The elements that are present in nature are important for their growth and functioning.  

Some of the naturally occurring elements can be toxic to the organisms. The environment consists of a lot of elements which are toxic to different living creatures. Such chemicals which cause toxicity are formed naturally in our surroundings like mercury,  formaldehyde, arsenic, and a lot more. These chemicals can end up causing adverse effects like allergies and infection in the body.

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In the photo, the mother is looking at a thermometer to determine if her child has a fever or not. a fever is a measurable sign. symptoms are not measurable and are only observed and felt by the patient. which of the following would be a symptom. The following would be a symptom is C. headache.

A thermometer is a tool used to measure hot or cold temperatures. In the medical world, a thermometer is used to measure body temperature to find out if someone has a fever or not.

Fever is a condition in which the body experiences an increase in temperature above 38 degrees Celsius. This usually occurs when a child has a disease and the body responds to the infection. The child's body temperature can be measured with a thermometer. In addition to measurable symptoms, a person who has a fever usually also experiences unmeasurable symptoms that only the child can feel, such as a headache. Headaches are caused by the pain nerves in the head becoming active due to the activity of chemicals in the brain or disturbances in the blood vessels in the brain because a person is having an infection.

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A list of things that should be present on the laboratory bench is.

a) Culture (upon which the experiment is done mainly experiment based on microbes)

b) Equipment and various instruments needed for that experiment to complete it.

d) Pencils or pens to note down your observation of the experiment.

A laboratory bench is a workspace used in a variety of schools, universities, research institutes, medical facilities, food safety institutions, and other places to conduct scientific studies or experiments.

The bench top is solid and resistant to a variety of acids, bases, salts, reagents, and other highly reactive compounds since it is constructed of phenolic resin, a petroleum-based chemical.

The ideal laboratory has a lab bench with a variety of equipment, including test tubes, beakers, pipettes, cylindrical flasks, droppers, bunsen burners, and other items. Additionally, it has a rack that holds numerous chemicals needed in experiments, including HCL, sulphuric acid, acetic acid, barium hydroxide, and others.

The complete question is attached.

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The repetitive polymerization of the monomers to form the polymers which can yield macromolecules with the diverse properties and functions and this can be done by varying the sequence of the subunits, the cell can make a diversity of different polymeric molecules.

Monomers are basically the basic structural units of the polymers. Monomers undergo polymerization to form complex structures which are known as the polymers. These monomers can be completely identical or can be of different types.

Different types of macromolecules exhibiting diverse structural organization as well as functions can be obtained by changing the sequence as well as type of subunits which are polymerizing.

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Answer:

Explanation:

well many doctors and scientists find ways to help and answer our questions

Explanation:

Making a time table on what to do on that particular day.

First: Know when work begins, and do other things as how you manage your time. remember time is ticking

DNA polymerases, which sequentially add nucleotides to the growing DNA chain while only integrating those that are complementary to the template, are responsible for the production of DNA.

The primary role of DNA polymerases is to preserve the genome and guarantee that the genetic code is reliably transmitted from one generation to the next.

Normal replication and repair are two major categories under which they offer polymerase activity. DNA polymerase uses its 3′–5′ exonuclease activity to fix mistakes during normal replication.

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Eradication of smallpox, Control of the rodent populations harboring the bacteria causing the plague, and the measles, mumps rubella, varicella vaccine (MMRV) are some triumphs whereas HIV/ AIDS, Hantavirus pulmonary syndrome and SARS are still some of the challenges that we face.

Smallpox has not occurred anywhere in the world since the year 1977. It has been basically eliminated as a naturally occurring infection in the human beings and this has been made possible by an effective vaccination. Plague caused by rodents harboring bacteria killed about 1/3 of the population of Europe in 14th century which has now been under control.

The MMRV vaccine is a very safe vaccine and is effective in the prevention of measles, mumps, rubella, and varicella. There is no current specific treatment, vaccine or cure for the hantavirus infection, SARS or HIV/AIDS which pose major challenges in healthcare.

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Option A: All the Galápagos finches are more closely related to one another than they are to mainland finch species, is the correct interpretation of the phylogenic tree.

The Galápagos finches are regarded as a prime example of an adaptive radiation, or the quick divergence from a common ancestor of ecologically distinct species. Modern molecular techniques and comparisons of the anatomical characteristics of the Galápagos finches demonstrate that they are in fact more closely related to one another than to any other species. As a result, choice A is accurate.

The evolutionary relationships between distinct organisms are shown visually in phylogenetic trees. Phylogenetic trees are hypotheses as opposed to confirmed facts. The branching structure of a phylogenetic tree shows how various species or other groupings evolved from a variety of shared ancestors. If two species of trees have a recent common ancestor, they are more closely linked, and if not, they are less related.

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Complete question is:

Examine the phylogenetic tree of the 13 finch species below. which of the following statements is a correct interpretation of the phylogenetic tree in the illustration.

All the Galápagos finches are more closely related to one another than they are to mainland finch species.

The sharp-beaked ground finch is more closely related to the small tree finch than either species is to the cactus finch.

The 13 finch species evolved in sequence; the warbler finch is the oldest species and the small ground finch is the most recent species to evolve.

The warbler finch is the common ancestor to all the finch species that exist today in the Galápagos Islands.

The simulation above is about the liquid level measurement. To solve the problem, we need to:

Liquid level measurement is a method to measure the volume of an object using the water level. When an object is added to the container, the liquid level is increased. The difference between the liquid level's after-and-before volume is also the total volume of said object.

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Answer:Function. The main sperm function is to reach the ovum and fuse with it to deliver two sub-cellular structures: (i) the male pronucleus that contains the genetic material and (ii) the centrioles that are structures that help organize the microtubule cytoskeleton.

Explanation:

Formation of ATP stores extra chemical energy in a molecule by forming a new chemical bond in Kreb's cycle. Therefore, option C is correct.

The Krebs cycle also called the TCA cycle or the citric acid cycle is a series of chemical processes that take place in the mitochondria and are essential for aerobic respiration that provides energy to nearly all living things.

It consumes oxygen and produces carbon dioxide and water as waste. ATP is created here from ADP. For the transport of an electron chain, this cycle makes hydrogen and electrons necessary.

Therefore, option C is correct.

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The field of PNI is most broadly concerned with how the psychological, neural, and endocrine systems together affect the immune system.

Thus, the correct option is C.

Psychoneuroimmunologists’ аreа of study, cаlled psychoneuroimmunology (or PNI for short), is а highly integrаtive field thаt exаmines how psychologicаl, neurаl, аnd immunologic processes influence eаch other аnd shаpe humаn heаlth аnd behаvior. Using а vаriety of different in vivo, in situ, аnd in vitro techniques in both humаn аnd аnimаl model system, PNI hаs yielded numerous discoveries thаt hаve helped to greаtly clаrify how sociаl, psychologicаl, аnd behаviorаl fаctors influence the аctivity of the immune system; how the immune system аffects cognition, emotion, neurаl processes, аnd behаvior; аnd how these bidirectionаl interаctions shаpe risk for а vаriety of mentаl аnd physicаl heаlth problems, including аnxiety disorders, depression, posttrаumаtic stress disorder (PTSD), cаrdiovаsculаr diseаse, chronic pаin, certаin cаncers, аnd neurodegenerаtion.

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In order to identify when and where changes happened over the course of human evolution, biological anthropologists rely on observable characteristics of the human body, such as the form and structure of bones and teeth.

Through the study of biology (particularly the skeleton), evolutionary theory, inheritance, the fossil record, and living primates, the field of biological anthropology explores the biological evolution and variation of human and nonhuman primate species. This research investigates the ways in which behavior, ecology, and biology are intertwined.

Skeletal biology, funerary studies, osteology, and archaeology are some of the research methodologies that are utilized by biological anthropologists in order to find answers to questions regarding the lives and lifestyles of previous populations. Bioarchaeologists seek answers to questions about how humans lived and died in the past by investigating the bones and burial sites of previous populations.

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Hypertrophic cardiomyopathy is a disease in which the walls of the ventricles of the heart are markedly thickened.

Hypertrophic cardiomyopathy, abbreviated as HCM, is a complicated form of cardiac disease that manifests itself in abnormalities of the heart muscle. It may result in:

A thickening of the muscle in your heart (especially the ventricles or lower heart chambers).

Left ventricular stiffness.

Mitral valve changes.

Cellular alterations.

This most frequently happens near the septum of your nose. The muscular wall that separates the left side of your heart from the right side of the heart is called the septum. When the septum that separates your heart's lower chambers, known as ventricles, becomes thicker, it can cause a number of problems.

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Option A. Hypertrophic Cardiomyopathy (HCM) is a genetic disorder in which the walls of the heart ventricles become abnormally thickened.

This thickening can cause the heart to become less efficient at pumping blood throughout the body, leading to symptoms such as:

HCM is a chronic condition that typically has no cure and requires lifelong management. Treatment may include medications to reduce the thickness of the heart walls, surgery to reduce obstruction in the heart, or implantable devices to regulate the heart rate.

Patients with HCM are advised to seek regular medical care to monitor their condition and to follow a healthy lifestyle.

Here's the full task:

Which of the following is a disease in which the walls of the ventricles of the heart are markedly thickened?

Choose the right option:

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In comparison to action potentials on presynaptic neurons, post synaptic neurons will experience action potentials less frequently.

So, action potentials require activation of voltage-gated ion channels found at very high concentrations along the axon hillock and at lower concentrations along the remaining of the axon, whereas postsynaptic potentials require activation of ligand-gated ion channels located on the postsynaptic membrane.

The synaptic cleft, which is a 20–40 nm gap between the presynaptic axon terminal and the postsynaptic dendrite, is where neurotransmitter is released from the neuron when an action potential reaches the presynaptic terminal (often a spine).

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The North Atlantic Buoy Station is experiencing ocean water sinking. It draws water with a lower density from the surroundings.

Ocean water loses heat to the atmosphere in chilly places like the North Atlantic Ocean, where it then turns cold and thick. Sea ice is created when ocean water freezes, leaving behind salt that makes the surrounding seawater saltier and denser. Water that is dense, icy, and salty sinks to the ocean floor.

Less dense water floats on top of denser water. The deep ocean currents that travel around the globe are propelled by this theory. Seawater is sufficiently dense to sink into the deep ocean and flow along the bottom of the basins due to a combination of high salinity and low temperature close to the surface.

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Approximately 4.5% of the Earth's surface is covered in ice, including glaciers, ice caps, and the polar ice sheets. This is a significant amount and has a major impact on the planet's climate and ecosystems.

Ice is primarily found in the polar regions of the Earth, such as the Arctic and Antarctica, and on mountains, including the Himalayas, the Rocky Mountains, and the Andes.

Some regions with colder climates, such as Greenland, Scandinavia, and Russia, also have ice and glaciers. In general, ice can be found anywhere where temperatures remain below freezing for a significant period of time.

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Answer:

D. chemical weathering.

Explanation:

Chemical weathering is a process in which rocks and minerals are broken down into new substances through chemical reactions with water, air, and other agents. This type of weathering differs from mechanical weathering, which involves the physical breakdown of rocks and minerals through processes such as frost wedging, abrasion, and unloading.

In chemical weathering, water reacts with minerals in a rock to dissolve or alter their chemical composition. For example, minerals containing iron can react with oxygen in water to form rust, while minerals containing calcium can react with carbon dioxide to form calcium carbonate. These reactions can change the mineral content of a rock, altering its physical and chemical properties. Over time, this can lead to the physical breakdown of the rock and the formation of new minerals and substances.

Explanation:

Right ventricle → Pulmonary trunk → Pulmonary arteries → Lobar arteries → Alveolar capillaries → Pulmonary veins → Left atrium

Answer:

C. Mutation

Explanation:

How does an antibiotic resistant bacterium enter into a population of non-resistant bacteria?

A.

natural selection

B.

asexual reproduction

C.

mutation

D.

competition

Starch is a carbohydrate and a natural component of most plants, including fruits, vegetables, and grains. Starchy foods are an essential part of a balanced diet, as they provide energy, fiber, and a sense of fullness. The body breaks down starch molecules into glucose, which is the body's primary fuel source.

Answer:

Starch is made up of long chains of sugar molecules that are connected together. Starch's primary role is to help plants store energy. In an animal's diet, starch is a source of sugar. Amylase, an enzyme contained in saliva and the pancreas that breaks down starch for energy, is used by animals to break down starch.

Explanation:

During the gram stain procedure, the reagent that represents the first step in the gram stain when the gram negative cells react differently than gram positive cells is Crystal violet. The correct answer is B.

The Gram stain is a laboratory technique used to differentiate between different types of bacteria based on the properties of their cell walls.

In the Gram stain procedure, a bacterial sample is first treated with crystal violet, which binds to the cell wall of both gram positive and gram negative bacteria.

The sample is then washed with iodine, which helps to fix the crystal violet in place and provide a contrast against the background.

After the iodine treatment, the sample is washed with acetone alcohol, which causes gram negative bacteria to lose the crystal violet and take up the red counterstain, safranin.

Gram positive bacteria, however, retain the crystal violet and appear blue or purple under the microscope. Thus, the different staining patterns of gram positive and gram negative bacteria can be used to identify the type of bacteria present in the sample.

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