Jane and Sally are discussing the process of conception, and Sally says that female babies are born with hundreds of mature eggs in their ovaries that are just waiting to be released. Jane disagrees and says that female babies are born with empty ovaries, and that eggs develop at the time of puberty. Who is right?

What was the land like over 500 million years ago? what was under the sea?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food