Muscle action that is not under a person's control, such as the heart pumping blood, is an example of muscle action. A.
extensor
B.
voluntary
C.
flexor
D.
involuntary

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

answer: that would be cheating

explanation:

helicase, i think thats it

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