How much producer biomass is supported in the ecosystem?

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

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from