What is the purpose of crossing-over in meiosis? A. to create mutations in gametes to increase variation
B. to randomly separate homologous chromosome pairs
C. to reduce the number of chromosomes in gametes by one half
D. to create new combinations of DNA on homologous chromosomes

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

What are they five steps of cloning?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above