How are tardigrades related to astronomy? A.
They live long enough to survive long space journeys.

B.
They are the only life form that requires no oxygen to survive.

C.
They can survive in extreme, harsh environments, including space.

D.
They are able to propel themselves in zero gravity environments.

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

9. the history of life on earth is recorded in

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?