what is the cell theory​

Allele frequencies in a population may change due to four fundamental forces of evolution: Natural Selection, Genetic Drift, Mutations and Gene Flow. Mutations are the ultimate source of new alleles in a gene pool. Two of the most relevant mechanisms of evolutionary change are: Natural Selection and Genetic Drift.

This story showed an example of convergent evolution. Convergent evolution is the process whereby organisms that are not closely related independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

In this story, the two species of birds, the crows and the jays, evolved to look similar as a result of living in the same environment and competing for the same resources.

The two species evolved to look similar in order to blend in with their environment, making it difficult for predators to distinguish them from one another. This allowed them to survive and thrive in the same environment.

Therefore, This example of convergent evolution is a perfect example of how species can evolve to look similar in order to survive in the same environment. It also shows how competition for resources can drive species to evolve similar traits in order to survive.

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Answer:

Living System

Explanation:

Living system can be defined as the internal systems of organisms and how materials circulate within organisms.

Generally, these living systems are self-organized life forms and are known to be very much interactive with their surroundings or environment. Also, living systems are dependent on the flow of information, matter and energy at various levels.

Some examples of living systems in organisms are respiratory system, nervous system, digestive system, and circulatory system.

Additionally, living systems comprises of the following components; cells, organs, muscle, tissues, blood, etc.

Answer:

Living system is correct!

Explanation:

I took the test!

Answer:

1. Reproduction

Explanation:

is the biological process by which new individual organisms – "offspring" – are produced from their "parents". Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction.

Answer:

20%

Explanation:

2 out of 10 is the same as 20 out of 100. So 2/10 = 2/100 or 20%

Answer: I wanna say that’s right

Explanation:

Answer:

The asteroid crashed into the earth and made some water bodies violent

it is said that the asteroid was super huge and was capable of causing volcanoes, tsunamis, etc which took place all over the earth and extincted dinosours. But it is a little surprising that crocodiles who were also found at that time survived all this

Answer:

Probably the asteroid caused natural calamities

Complete question:

This model of the cell cycle includes two arrows that each represent a process in the cycle.

What do the two arrows represent?

A. Arrow 1 represents prophase, and arrow 2 represents interphase.

B. Arrow 1 represents mitosis, and Arrow 2 represent meiosis.

C. Arrow 1 represents interphase, and Arrow 2 represents mitosis.

D. Arrow 1 represents meiosis, and Arrow 2 represents prophase.

(You will find the cycle in the attached files)

Answer:

C. Arrow 1 represents interphase, and Arrow 2 represents mitosis.

Explanation:

When we talk about the whole cell cycle we are referring to the interphase and the cell division (mitosis or meiosis).

Interphase: Represented in the cycle by arrow 1.

The interphase is the previous step before mitosis occurs. The interphase is conformed of the G1, S, and G2 stages.  

• During the G1 stage, it occurs a high intense biochemical activity. The cell duplicates its size, and the organelles and other molecules and cytoplasmatic structures duplicate too. Some structures, such as microtubules and actin filaments, are synthesized from zero. The endoplasmic reticulum increases in size and produces a membrane for the Golgi apparatus and vacuoles, lysosomes, and vesicles. During this stage, the pair of centrioles separate, and each centriole duplicates. Mitochondria and chloroplasts also replicate.  

• During the S stage occurs the DNI replication process. At this point, also occurs the synthesis of histones and other associated proteins. This is the only stage where the DNI molecule is replicated.  

• G2 stage is the final one before the cellular division. Here begins the slow process of DNI condensation. Duplication of centrioles completes. Structures such as spindle fibers are assembled.

Once the whole interphase is completed, mitosis occurs.

Mitosis: Represented in the cycle by arrow 2.

Mitosis is a process by which, from a diploid somatic cell (2n), two daughter diploid cells (2n) are produced. During mitosis, the cell separates. Mitosis is divided into four phases (these phases are shown in the cycle with different gray color tones). In the prophase, it occurs chromosomes condensation and nuclear membrane breaks. During the metaphase, fibers of the spindle apparatus capture chromosomes and take them toward the center of the cell, to the equatorial plane, where they line up. Each chromatid joins with a microtubule of opposites poles. Sister chromatids are held together until they reach the Anaphase, during which other enzymes are activated to break the bonds and separate the chromatids, which migrate to the opposite poles. In telophase, the duplicated chromosomes are already in the corresponding poles, and the nuclear membrane forms again in each pole. Finally, occurs cytokinesis.

Answer:

Explanation:

The human ear can easily detect frequencies between 20 Hz and 20 kHz. Hence, sound waves with frequency ranging from 20 Hz to 20 kHz is known are audible sound. The human ear is sensitive to every minute pressure difference in the air if they are in the audible frequency range.

Answer:

The human ear can easily detect frequencies between 20 Hz and 20 kHz. Hence, sound waves with frequency ranging from 20 Hz to 20 kHz is known are audible sound. The human ear is sensitive to every minute pressure difference in the air if they are in the audible frequency range.

Hope this helped!

Answer:

An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.

:

Answer:

The production of toxic chemicals

Thorns

Explanation:

Answer: 1. Was based on the distribution of rock types, fossils, and structures.

Explanation: Good luck! :D

Answer:

The correct answer is - option B. it increases the amount of genetic variation in the species.

Explanation:

Meiosis is a type of cell division that takes place in sex cells or reproductive cells. There is crossing over takes place which is a process where the genetic exchange of chromosomes occurs between non-sister chromatids of homologous chromosomes.

The crossing over leads to the new genetic combinations of genetic material which result in the genetic variation in species. This variation plays a role in the natural selection and evolution of species.

Answer:

When a long-term environmental change occurs, certain individuals in a population will be better adapted for the new environment than others. These individuals will be more likely to survive and pass on their traits to their offspring. Over many generations, these favorable adaptations build up in a population. This may lead to speciation, which is the development of a new species.

Explanation:

Answer: The correct option is C.

myrmecophytes.

Explanation:

This is because ants and myrmecophytes have mutualistic relationship in which the plants provide food, and accomodation to the ants through the structural adaptations of plants like dormatia, fruiting bodies, nectaries flowers. The ants inturn ahelp the myrmecophyte in pollination, seed dispersal, to defend it against Intruders and also help it to gather nutrients.

Answer:

SCIENTIFIC NAME: Ursus arctos horribilis

TYPE: Mammals

DIET: Omnivore

AVERAGE LIFE SPAN IN THE WILD: 25 years

SIZE: Five to eight feet

WEIGHT: 800 pounds

SIZE RELATIVE TO A 6-FT MAN:

Answer:

D.

I, II, III, IV, V, and VI

Answer:

46

Explanation:

Every cell in the human body contains 23 pairs of such chromosomes; our diploid number is therefore 46, our 'haploid' number 23. Of the 23 pairs,

Answer:

0.33hours

Explanation:

The speed of a moving body can be calculated by using the formula;

Speed = distance ÷ time

According to the information provided, the time it would take Craig to ride the skateboard on the sidewalk at an average speed of 18km/h for a distance of 6km is being asked.

Hence, derived from the above formula;

Time = Distance/speed

Time = 6/18

Time (hr) = 0.3333hr or 19.8minutes

Answer:

They have four limbs

Explanation:

THey have four limbs

Answer:

See the answer below

Explanation:

Let the allele for hair color be A (a) and the allele for tail shape be B (b). Straight hair A is dominant over curly hair a and spikes B is dominant over plain tails b. Hence, the phenotypes and their respective genotypes would be as follows:

       Phenotype     Genotypes

Answer:

Cell Wall

Chloroplast

Large Vaculoe

Explanation:

None of these are found in an animal cell.

Answer:

Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.

The 2 chemicals inside skeletal muscle are : i) Organophosphate ( OP ) and ii) Acetylcholine ( ACh )

The skeletal muscle is toxic in nature due to the presence of certain chemicals ( Organophosphate and Acetylcholine ). and this causes the skeletal muscle to experience some level of toxicity. some of the toxic effects caused by the presence of these chemicals in the skeletal muscle include :

Hence we can conclude that the 2 chemicals that can be found inside skeletal muscle are Organophosphate ( OP ) and Acetylcholine ( ACh )

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Answer:

The first sentence changed by having the word "fat" added. The second sentence changed by the "d" is gone from the word dog and the rest of the letters afterward kind of combined.

Explanation:

Answer:

It is translation

Explanation:

The translation is the process of protein synthesis where the information on RNA is expressed in the form of polypeptide chains.

Answer: transcription

Explanation:

Answer:

2 membrans

Explanation:

We have that for the Question it can be said that

These properties of the luster might help the scientist classify the  luster as metallic.

From the question we are told  

Earthy, shiny, waxy, metallic, and pearly are terms used to describe a mineral's luster.

What might a scientist observe about a mineral that would help the scientist classify the

luster as metallic?

Generally

Therefore

These properties of the luster might help the scientist classify the  luster as metallic.

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