What must skeletal muscles do to move? A. engage their fibers slowly B. twitch involuntarily C. separate from the bone D. contra
ct and relax
2 answers:
Answer:
<em>They must contract and relax</em>
Explanation:
Answer:
the answer is D.contract and relax
Explanation:
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B would be the correct answer
False.
Extinction = Behaviors that are not reinforced will become weaker (occur less often).
The correct answer would be "who is coming with us" assuming Jim is highschool level or younger, a chaperone should accompany them.
