Which is not a function of the kidneys? they regulate osmolarity of the body fluids. they control blood pressure. they remove metabolic wastes from the blood. they regulate red blood cell production. they regulate plasma protein levels in the blood?

The answer is they regulate plasma protein levels in the blood. Blood proteins do not pass into the glomerular filtrate during filtration at the glomerulus. Therefore, kidneys have no role in their regulation. Kidneys influence RBCs production by producing erythropoietin which targets the erythroid colony-forming cell. Osmolarity is regulated by regulating re-absorption of water and sodium ions. Kidneys control blood pressure by regulating blood volume.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem