Which animal has the simplest known central nervous system?
a. a flatworm
b. an arthropod
c. a chordate
d. a mollusk
e. an echinoderm
ANSWER: a
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a. a myelinated axon with a small diameter b. an unmyelinated axon with a small diameter c. a myelinated axon with a large diameter d. an unmyelinated axon with a large diameter e. all myelinated axons regardless of diameter
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Which of the following animals is phototrophic?
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