Photosynthesis makes the glucose which is then used in cellular respiration to make ATP. Glucose is turned back into carbon dioxide, is also used in photosynthesis. Water is broken down to form oxygen in photosynthesis and cellular respiration oxygen is combined with hydrogen to form water. Photosynthesis requires carbon dioxide and releases oxygen. Cellular respiration requires oxygen and releases carbon dioxide. The released oxygen is used by organisms for cellular respiration. Organisms breathe in oxygen, which is carried through blood to all our cells. In the cells, oxygen allows cellular respiration to proceed. Cellular respiration works in the presence of oxygen, without oxygen, much less ATP would be produced.
have you ever seen a lake or body of water with a layer of green on top? That's eutrophication due to heavy amounts of growth nutrients (primarily from runoffs from agriculture) in water. Simple plants utilize those and grow very fast. As they grow, they take up the oxygen and make water oxygen poor. These produce deadzones cuz the water life basically suffocates to death due to less oxygen. Eventually plants will also die
Yes, the taiga ecosystem is home to evergreens. The taiga system is a slightly warmer ecosystem then Tundra. You kind find a lot of taiga in Canada and Parts of Europe.
