The basic unit of contraction in a muscle is the

a. myofibril.
b. sarcomere.
c. sliding filament.
d. contractile vacuole.
e. Z band.


B

Biology & Microbiology

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Psilotum lacks

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Which cells aid in the operation of the nervous system but are unable to conduct nerve impulses?

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To be a viable alternative, nuclear power facilities must have

A. proper waste disposal. B. security. C. safe operation. D. All of these.

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