Petrification is defined as <span>the process by which organic matter exposed to minerals over a long period is turned into a stony substance so A.
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<em><u>Answer:</u></em>
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<em><u>C: </u></em><u><em>Gregor Mandel</em></u>
To keep the body's internal environment in balance c) to make room for nutrients coming in d) to reduce unpleasant
It's either species eat or populations evolve. Think about the food chain, about how it transfers energy through organisms.
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motive
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observation
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reaction
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stimulus
The cue or combo of cues that produces a response is called a 
, which is a thing or event that causes a specific reaction in an organ or tissue.
