Answer:
B. The hamstrings must relax.
Explanation:
When the quadriceps contact, the hamstrings must relax at the same time.
A Thermocline is the temperature of water, while Pycnocline is the density of water. Both are a type of ecoline. I'll update if you need more information.
C. The exact amount of nonrenewable energy resources is not currently known.
Because when the air cools hot air rises and so does the moistier and then it condenses and produces clouds which produce rain
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