How do scientists theorize that cyanobacteria affect the development of endosymbiosis?

How are tumors cells different from normal cells

How do you date a sample of rock that you suspect as being one of the earliest on earth

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