Points C and D are correct statements for Natural Selection.
Natural selection is the process by which organisms develop variation in traits, which gives them the better chance of survival and Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce.
Explanation:
Darwin postulated in his theory that over a period of time there are changes in physical or behavioral traits which are transferred from parent to the next generation. The changes which led to the better adaptation to the environment will help survive the organisms. Such organisms will reproduce.
The best answer is B. The biome that dominates the eastern region of the United States is the temperate biome. This biome are located in mid-latitude regions therefore in polar regions and tropics. This biome is exposed to warm and cold air which will cause this area to have four seasons.
Commensalism is defined as a relationship between two species where one has certain benefits from the relation and the other is unaffected. So, in this case, it is hard to determine what kind of relationship the gray wolf and human populations have because when people intervene to help protect a species they are officially unaffected, they do not lose or gain anything, but the gray wolf is one of the key species in their ecosystem, so protecting them is beneficial for the ecosystem, therefore can have numerous positive effects on human-environment too.
