I think the correct answer from the choices listed above is the first option. Regulatory proteins of the cell cycle help maintain homeostasis by controlling <span>the cycle by signaling the cell to either or delay the next phase of the cycle. Hope this answers the question.</span>
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It's solar, because s</span>olar energy is a renewable resource that is virtually endless as long as the sun shines.<span />
The ones about enzymes are chemical digestion and the ones about chewing are mechanical digestion.
Will occur spontaneously without the need of an activator because they have a great internal energy
