The absence of which substance causes a switch from aerobic to anaerobic respiration? . a. oxygen. b. carbon dioxide. c. atp. d. pyruvate

Which of the following represents a negatively charged ion? of t 7

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

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material