Microscopic organisms with calcium carbonate shells are called .

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

What must be true for natural selection to heppen

Which feature of a human community is similar to a niche in a biological community