What are all the nine biomes

The answer is B. vessels, heart, circulating fluid

Answer:

C. Why do some farm choose to use pesticides?

A seed is a plant organ that consists of an embryo, tissues, and a protective coating.

What is an Ovule?

The ovule is defined as the structure that gives rise to the female reproductive cells and consists of three parts: the integument, its outer layer, the nucellus which is the remnant of the megasporangium, and the female gametophyte which is formed from a haploid megaspore at its center.

The ovules are found attached to the placenta in the ovary through stalk-like structures that develop into seeds after fertilization where the seeds consists of an embryo, tissues, and a protective coating.

Thus, a seed is a plant organ that consists of an embryo, tissues, and a protective coating.

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Answer:

Chromoplast is that plastid which is found in the cells of yellow petals.

Darwin's theory of Evolution by Natural Selection is not just a theory, because it can be testable. A hypothesis becomes a theory once it is supported by evidence (option C)

Charles Darwin described natural selection as an evolutionary phenomenon in which the fittest and strongest animal survives in nature, with the weakest animals dying first, greatly reducing the likelihood that they will have offspring. Therefore, the strongest are the ones that have offspring and pass on their most optimal traits so that these offspring are in turn more fit.  

Each organism has different characteristics, and when organisms of a species reproduce, the progeny inherit these characteristics. Those members of the population with characteristics that are less adapted to the environment will be less likely to survive. And those with better characteristics are more likely to survive. For example, a gazelle that is slower to run because of some defect will be less likely to survive because it is likely to be chased and caught by a carnivorous animal. And this hunter is less likely to catch up with another gazelle that is stronger and faster to escape. In turn, this stronger gazelle, by surviving, will be more likely to reproduce and leave equally strong offspring.

Therefore, the classic definition of natural selection establishes that the conditions of the environment can hinder or favor the survival and reproduction of species and this determines that they evolve to adapt more and more. Therefore, evolution is the set of changes in a population, through generations. This process has originated the diversity of species from a common ancestor. For this to happen, traits must be variable between individuals and be related to survival and must be inheritable.

On the other hand, it should be clarified that a theory is a body of knowledge that explains a phenomenon based on observation or reasoning.

The right answer is:

• C. A hypothesis does not become a theory until it is already supported by evidence: A hypothesis (an assumption made before any evidence or observation is obtained) does not become a theory until it is already supported by evidence.And as already stated, a theory is made after testing, with evidence. Then, evolution can be testable, analyzing the existing evidence. For example, the shared characteristics between species (which indicate that they were descended from a common ancestor) such as the arms of humans and the fins of whales which have the same common ancestor although they do not have the same function.

Let's explain why the other items are incorrect:

• A.  It does not rely on dependent variables, only independent variables: A dependent variable is an outcome or variable that depends on other variables while an independent variable is one that affects the outcome, and in turn is not affected by anything. So, both depedent and independent variables are used to explain Evolution and Natural Selection. For example, an independent variable could be the the availability of feed, while the dependent variable could be the amount of feed that the animals can incorporate. The more skilled the individuals are (hunting, climbing), the more food they can obtain.

• B. It has more evidence than a hypothesis, but less than a law: Darwin's theory is not a law because a law is a statement about an observed phenomenon, however it does not explain what causes it. Currently, there is evidence to explain how the evolution of species evolved.
• D. It is just a theory, it is equivalent to a guess: A theory is not just a guess is because as it was explained, it is supported by observations, studies and evidence.

So, Darwin's theory of Evolution by Natural Selection is the result of adaptations to the environment of organisms and can generate genetic mutations that lead to improvements in phenotypes and generate new species. And it is supported by scientific evidence by studying physiology, comparative anatomy between species, among other things.

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Answer: C

Explanation: Darwin’s theory of evolution is based on Natural Selection. Natural Selection can be defined as the ability of an organism to evolve based on its suitability to the environment through genetic traits that are inherited by offspring.

Darwin’s Theory is not just a theory because it is testable, and can be used to make logical future predictions.

An example of this is the evolution of man.