Answer:
gene flow is the transfer of genetic variation from one population to another.
option D
Answer:
Evolution takes place every generation of a species. The more rapid a species procreates the quicker it can respond to percieved threats & challenges in its environment. This is why insects, rodents, bacteria, and viruses can more readily adapt to chemical sprays or agents that are used to kill it. Mosquitos and DDT are such prime example of adaptation; mosquitos that survived DDT became more immune to its effects through genetic changes for each generation exposed.
Explanation:
A scientific theory can always be disproved if someone comes along with better evidence which shows another theory is true. However, most other theories are small improvements on existing ones. Evolution and natural selection (the theory that animals' populations change over time because their environment encourages specific different features for individuals that happen with mutation) was an improvement on the existing "theory" that animals were built to be fit for their environments. The earth rotating around the sun was a theory improving on the idea that the sun and the earth move around so that it looks like the sun moves around the earth. All of these happened because there was evidence, so while theories aren't always absolutely true, many modern theories are typically well-tested and if they aren't, they are usually refered to as hypotheses or models (although models can sometimes also be theories, like the Standard Model)
I take this class so the answer is A single stranded dna molecule serves as a template
Answer: Coelenterates as a whole are of little economic importance. Seldom used as food by man, they are eagerly devoured by certain fishes and by invertebrates such as the crown of thorns starfish. Certain corals used as ornaments and for the manufacture of jewelry have become rare because of exploitation.
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