Which of the following best describes what happens during a cross-over event?
Answer:
Chromatids of homologous chromosomes exchange corresponding segments.
Explanation:
The crossover of chromosomes is the exchange of genetic material between homologous chromosomes. Homologous chromosomes are present in the meiosis I, but not in meiosis the II. After pairing up of in the prophase I, homologous chromosomes are able to exchange some corresponding segments and a cross-over occurs. Thanks to the cross-over event, each chromosome will have a new combination of genes. Without this, parents will produce gametes with only two different gene combinations.
Answer:
Chromatids of homologous chromosomes exchange corresponding segments.
Nonnative species are not always a negative factor, they become invasive species __________.
a.
as soon as they are introduced in an ecosystem
b.
as soon as they leave their original ecosystem
c.
when they start consuming the food meant for the native species
d.
when their presence become economically or environmentally damaging
e.
when they control other species
Answer:
its d
Explanation:
The correct option is D.
What is a nonnative species and how does it disrupt an ecosystem?
Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats. This can result in huge economic impacts and fundamental disruptions of coastal and Great Lakes ecosystems.
What is an example of nonnative species?
The Gypsy Moth, Nutria, Zebra Mussel, Hydrilla, Sea Lamprey, and Kudzu are examples of non-natives that have caused massive economic and ecological losses in new locations because the natural controls of their native ecosystems were not there.
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What is the role of decomposers in an ecosystem?
A Decomposers break down dead organisms and return nutrients to
the ecosystem
B. Decomposers are herbivores.
C. Decomposers convert solar energy to chemical energy through the
process of photosynthesis.
D. Decomposers feed on small reptiles and mammals.
Which process is necessary for sexual reduction but not asexual reproduction.
A.Production of new cells.
B. Copying from genetic material.
C. Meiosis.
D. Division of cells
Answer:Meiosis
Explanation:
Answer:
A.Production of new cells.
Explanation:
how are carnivores and omnivores alike?
What is one advantage of
convex mirrors for this use?
Answer:
It always gives a virtual, erect and a diminished image.
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Who invented the cotton gin?
Answer:
Eli Whitney
Explanation:
Answer: Eli Whitney
Explanation:..........
Which is a density-independent factor?
food
water
drought
habitat
Answer:
habitat
Explanation:
Density-independent factors, such as weather and climate, exert their influences on population size regardless of the population's density. In contrast, the effects of density-dependent factors intensify as the population increases in size.
The fossil record reveals that the diversity of flowering plants and the diversity of certain insect groups increased at the same time. How might you explain this?
Answer:
Insects and flowers are connected with each other for several life purposes such as for food, habitat and pollination.
The cause of diversity in flower and insects is associated with the process of pollination. In the process of pollination, both insects and flowers are mutually get benefits.
Insects move flower to flower in search of food and in the process it also carry pollen from flower to flower as well. Through insects the pollen reaches to different flower and show diversity and at the same time insects feed on various types of flowers and reproduce generation with variations.
Hence, the process of pollination makes a relationship between flower and insects diversity at the same time.
What do many ecologists feel is necessary for an area to be classified as a forest?
a.) several species of trees
b.) enough trees to create a close canopy
c.) consistent warm weather
Answer:
B. Enough trees to create a close canopy.
Explanation:
Forests may have several tree species but one very important feature of forests is their close canopy of dense trees, often arranged in several strata (or layers).
The reason why in forests shorter trees do not survive as well as trees that reach the top of the canopy, would be light distribution and access to sunlight.
What is the use of sunlight?Sunlight must be remembered that sunlight has the vital element for the plant survival without it the photosynthesis that cannot take place, or it will not be as the efficient as it would be if there was the full access to the sunlight. Sunlight activates the electrons on the chlorophyll and with that a plant has able to produce the ATP, which has the basic energy-producing unit in any living cell.
As such in the dense forests where we have tall and the shorter, trees, those that reach the highest point of the canopy have the access to most of the sunlight, while the shorter ones have to make do with whatever filters through the branches of the others.
Thus by not having as much access to sunlight, their photosynthetic processes are not as efficient. Those that adapt to lesser amounts of light, will survive, but the others would not.
Therefore, The reason why in forests shorter trees do not survive as well as trees that reach the top of the canopy, would be light distribution and access to sunlight.
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What pumps oxygen-rich blood to the body?
A. Right Atrium
B. Right Ventricle
C. Left Atrium
D. Left Ventricle
Which is an example of a fungus? brown algae slime mold bread mold blue-green algae
Answer:
either blue green alge or bread mold
Answer:
its
Explanation:
bread mold
What are some advantages and disadvantages of using wind energy to
create electricity?
Answer:
Advantages: Wind turbines do not actively create green house gases, wind is an indirect solar energy (which means it never runs out), and it has a fairly high net energy
Disadvantages: NIMBY effect (not in my backyard, it means people support it, but they don't want to be near it), transportation and construction of materials cause greenhouse gases, and wind turbines can kill/harm birds and bats
Explanation:
Gathering, constructing and transporting materials to build wind turbines releases green house gases, because of vehicle's combustion and factory emissions. However, wind turbines rely on a renewable resource that a) never runs out, and b) is a clean source of energy. Compared to nonrenewable energy sources, wind is a good energy source.
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What are 5 ways carbon dioxide is released into the environment?
What is the role of decomposers in the carbon/oxygen cycle?
How do humans impact the carbon/oxygen cycle
Why do people with ADHD/ADD have to take pills to stay focus??? How do those pills work and is there another solution besides taking pills?
Answer:
Explanation:
ADHD pills make you focus more, be less hyper and pay attention to things more.Some side effects are suppression of appetite, moodiness and headaches. Solutions besides taking pills are paying attention, getting restful sleep, improving nutrition.
Which of the following sequence is correctly describes the path of sperm to formation to ejactulation?
Answer:
the answer is testes, vas deferens, prostate, urethra
In living things, what is the source of the Carbon 14 that is used in radiocarbon dating?
In living things, the source of Carbon-14 that is used in radiocarbon dating would be Carbon Dioxide in the atmosphere.
Which of the following best describes how energy is transferred in a food web?
A. A All energy is transferred to each level of a food web.
B. B Energy flows from producers to one or more levels of consumers.
C. C Consumers transfer their energy to producers.
D. D Decomposers get their energy directly from the sun.
Answer:
B.
Explanation:
Energy flows from producers to one or more levels of consumers. Think of it this way:
A banana tree grows in the forest.
A monkey eats the bananas off of the tree, it now consumes the energy provided by the banana.
(whatever animal kills monkeys) kills the money for food, they have now consumed the energy of the monkey, as well as the banana the monkey has eaten previously.
The web continues, and energy continues to be distributed to each level of consumer, all starting with a single producer.
Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flower producing pea plants together over six generations. The results of Ralph's selective breeding are shown above. What did the selective breeding do to the population of pea plants?
A.
increased its genetic diversity
B.
decreased its genetic diversity
C.
caused a new species of pea plant to form
D.
caused a pea plant to exhibit a new characteristic
Answer:
B. decreased its genetic diversity
Explanation:
if the number of chances the white flower decreases, and there are more purple chances, then there is less genetic diversity.
Answer:
It's B
Explanation:
What is the process of water moving down through the cell call
Answer:
Osmosis
Explanation:
Water moves across cell membranes by diffusion, in a process known as osmosis.
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Select the best answer for the question.
19. The component that makes up the majority of blood is
itled fold
O A. platelets.
O B. plasma.
O C. white blood cells.
D. red blood cells.
Answer:
B. Plasma
Explanation:
We normally have 55% plasma in our blood stream, plasma pumps out all of the waste of products and brings nourishment to our metabolism.
What does an urn-shaped age pyramid represent? A. a stable population growth B. a low birth rate C. a low death rate D. a growing population
Answer:D
Explanation:
The end of the sun's life will include which event?
A.
a white dwarf cooling into a black dwarf
B.
the core collapsing after a supernova to form a neutron star
C.
a nebula aggregating together to form a protostar
D. a planetary nebula expanding into a red giant
Answer:A
Explanation: Once all the helium disappears , the forces of gravity will take over , and the sun will shrink into a white dwarf .
Zebra mussels can move from one lake to another by which method?
Answer:
Zebra mussels are spread from one body of water to another by natural flow, carried on the feathers or feet of birds, or by humans in bait buckets or on boats.
How are sponges and the coral in coral reefs similar?
Both are a source of chemicals that may be used to fight human diseases, such as cancer.
Both release large amounts of oxygen into ocean waters, and the oxygen is eventually used by humans to breathe.
Both are widely found in deep, cold oceans as well as in warm, shallow waters.
Both are small ecosystems that do not have a heavy impact on other organisms.
Answer:
c I think
Explanation:
coral and sponges can live in a variety of places
Answer:
Both are a source of chemicals that may be used to fight human diseases, such as cancer.
Explanation:
Got it correct on Edg. 2021
In this article the author explains what scientists are trying to find out. What are the scientists in the article trying to find out?
Question 2 options:
A .when sulfur first appeared in Earth’s early atmosphere
B .how the proportions of different sulfur isotopes change in the geologic record
C .how the ozone layer formed and the effects of its formation
D .when oxygen increased in Earth’s early atmosphere
Hi, did you forget to mention that this question is about the article "The Rise of Oxygen in the Earth's Atmosphere" by American Museum of Natural History
Answer:
D. when oxygen increased in Earth’s early atmosphere
Explanation:
Right at the beginning of the article we can find out what scientists are trying to discover. This is because the introduction of the article introduces us to Grant Young and Jay Kaufman, a university professor and a geologist, respectively, who are the main scientists in the study that seeks to discover and set firm dates for the increase in oxygen in the Earth's primitive atmosphere.
BRAINLIEST!!!! What are the types and morphs of boa constrictors?
What term refers to the lifestyle of a woman who slows her career advancement by choosing a career path that allows a mother flexible or reduced work hours?
Answer:
Mommy Track
Explanation:
the "Mommy Track" is a common term for a career path for women that can allow for greater work-life balance, thanks to reduced hours or flexible schedule, but often at the cost of career advancement.
Mommy track refers to the lifestyle of a woman who slows her career advancement by choosing a career path that allows a mother flexible or reduced work hours.
What is Mommy track?The mommy track is the way in which a woman's life prioritizes being a mother and can refer to work arrangements specifically for women in the workforce that facilitate motherhood, like flexible hours.
It also offers lesser opportunities for career advancement at the same time.
This is the general term for women who may allow for greater work-life balance thanks to shorter hours or flexible schedules but also at the cost of career advancement.
Thus, mommy track refers to the lifestyle of a woman who slows her career advancement by choosing a career path that allows a mother flexible or reduced work hours.
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Describe the similarities and differences of a community and a population.
PLZ HELP I ONLY HAVE ONE MORE DAY! I WILL MARK BRAINLIEST
Answer:
community: collection of populations. population: one area specified specie.
Explanation:
let's suppose you have a home garden where you have dogs birds crops trees and each one is a different specie.If you encounter on individual level then it's specie but on collective level- community-perhaps it's easy to say and give the example of pound community and field of wheat -population-.