For aerobic cellular respiration to take place, cells need oxygen. what is the source for this oxygen? the breakdown of glucose the air the breakdown of carbon dioxide the water

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Explain why the plants cortex would serve as the best food source for animals

How can an organ, such as the lungs, work for multiple body systems?