It is protected by a mucus layer formed on the surface regularly that ressist ph values.If it isn't formed our body will eat itself.
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Answer:
Speciation can be driven by evolution, which is a process that results in the accumulation of many small genetic changes called mutations in a population over a long period of time. ... Natural selection can result in organisms that are more likely to survive and reproduce and may eventually lead to speciation.
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I believe the answer is D, but not 100%
Answer:
water
Explanation:
because the others are in compounds and can not be considered as products lonely.
