When lifting a heavy weight, more motor neurons are called into action to overcome the weight by creating a greater tension. this phenomenon is known as

The answer is recruitment.

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the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.