Most of the time m (M) means male and f (F) means female.
The answer is water. It is mainly absorbed in the ileum and re absorbed in the colon. But note that not all water you take in is absorbed, as the faeces is wet.
Answer:I’m not sure About natural selection but the relation of biology and evolution is the adaptation of other species through the years for example it has been a theory that the grizzly bear an black bear descended from the polar bear when a number of polar bears started living in warmer areas they had trouble living in there new environment because they were made for the cold but after many years of living there their offspring started to have different quality’s that made them more suitable to survive the environment like different colored fur and different claws this can be considered a form of evolution
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A. Seafloor splits open creating a large trench
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I hope this helps
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responsibility
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im not pretty sure if that's right but I hope that helps