Plants absorb what color of light for photosynthesis

Which of the following is not a defining characteristic of plants?

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

How do specific cell structures and organelles contribute to maintaining homeostasis in the cell?