Variation in a trait is a required condition for natural selection to act on a population for that trait. assuming a population of organisms started with only one form of trait, what are two ways variation in the trait could be introduced into the population? explain your answer.

The mammal pictured below is a silvery mole rat. which statement is an inference based on the picture? the animal is ugly. the animal has hairless feet with sharp claws. the animal has prominent upper and lower incisor teeth. the animal likely has poor vision since its eyes are so small.

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?

Do plant cells perform cellular respiration?