When the water enters the cells, they swell and become bowed. This causes the guard cells to bend away from each other, thereby opening thestomata. Conversely, when guard cellslose potassium ions, water diffuses out of the cells by osmosis.
Proteins in the cell membrane that assist with facilitated diffusion are known as carrier proteins or transport proteins since they carry material across the cell membrane .
Answer:
Blood absorbs and distributes heat throughout the body. It helps to maintain homeostasis through the release or conservation of warmth. Blood vessels expand and contract when they react to outside organisms, such as bacteria, and to internal hormone and chemical changes.
Answer:
Scientists believe that the different types we know emerged as early humans adapted to infectious diseases.
Explanation:
Different human blood types probably emerged to ward off infectious diseases. The incompatibility of some blood types, however, is only an "accident" of evolution. But this is a relatively recent problem, since blood transfusion has been around for only a few hundred years.
There are four main blood types. The oldest is B, which must have originated about 3.5 million years ago - it existed even before the human species evolved from its hominid ancestors, from a genetic mutation that modified one of the sugars in the surface of red blood cells.
Approximately 2.5 million years ago, mutations inactivated sugar, resulting in type O blood, which has neither type A nor B. sugar. AB blood, as it is easy to suppose, is covered by both sugar A and sugar by B.
Answer:
air and water
Explanation:
because those two are the only ones in this list that dont eat, breathe, or reproduce
