Located in the linings of the digestive system, ....
The correct answer is stem cell research and animal testing.
Answer:
A habitat meets all the environmental conditions an organism needs to survive. For an animal, that means everything it needs to find and gather food, select a mate, and successfully reproduce. For a plant, a good habitat must provide the right combination of light, air, water, and soil.Jan 21, 2011
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Explanation: