an earthworm has a heart that moves blood.

what is the main function of this organ?

a. to take in oxygen and remove carbon dioxide

b. to take in and digest food

c. to transport materials to and from body cells

d. to respond to the environment

Theories basic to all of the life sciences include the germ theory of disease. theory of evolution by natural selection. o two of these answers are correct none of these answers are correct o cell theory.

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these