What are three functions of the life support system on a spacecraft?

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

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

Explain how scientists use geologic time to determine the age of landforms.