In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?
A. They are serially repeated in the body segments of the body.
B. They are all used in locomotion.
C. They all play a role in excretion of waste from the body.
D. They all play a role in the reproductive activities of the earthworm.
A. They are serially repeated in the body segments of the body.
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The broadest level in a trophic pyramid is primarily composed of:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers.
Radially symmetrical animals have loose meshes of neurons that are called
a. nerve nets. b. brain nets. c. ganglia nets. d. nerve cords. e. cephalization nets.
Describe the colonial theory of animal origins
What will be an ideal response?
Sporophyte plants produce spores using:a
mitosis. b. meiosis. c. fertilization. d. macrogenesis. e. microgenesis.