At one time Charles Darwin bred pigeons. By selecting and cross breeding the pigeons with traits he wished to study, he was able to produce in only a a half dozen generations a new variety of bird that hardly resembled their recent ancestors. This contributed to his conviction that

Growth of chest hair, deepening of the voice, and muscle growth are secondary sex characteristics. which most likely affects the development of these traits? testes ovaries prostate gland vulva

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.