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different plants grow in different climates so when humans don't interfere then the only thing that will grow is that which grows well in that climate.
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Answer:
The nervous system controls movement and balance, the five senses (sight, hearing, taste, smell, and touch), your thought processes, and how awake and aware you are. It includes the brain, the spinal cord, and all the nerves in the body.
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Hoped this helped.
The answer that fits the blank is the term CHANCE. There would always be variability between the groups because of the variability of the given samples and how these samples are being treated in the first place. This is when chances enter.