After holding the weight for so long, the muscle would get tired, in an effort to tell the brain to stop holding the weight because the muscle fibers cannot handle it any more. Lactic acid is a by-product during muscle contraction that leads to the pain.
The answer is Testicles (testes)
The correct answer is C.
The cyanobacteria hypothesis is a leading theory for how O2 was made prevalent.
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Organic in chemistry is to have carbon. but all carbon, nitrogen, oxygen and sulfur are common atoms in organic molecules so go with D. All of the above
They are located in the liver the wall of the sinusoids.
