Many organisms get energy by eating other organisms.
a(n) is an organism that hunts and kills for food.
a. predator; prey
b. prey; herbivores
c. prey; predators

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

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes