Answer:
In the human body, cells are the basic units of life. Groups of cells working together for a specific function form tissues. Organs are two or more tissues operating together. Even separate organs work together, forming body systems.
Explanation:
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The amount of time that the 2 species have been evolving apart??
D. to help scientist plan an experiment in when ch no animals or humans are harmed.
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➷ It would be 'niche.'
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