Why do you think that natural selection can explain that, in some species of frogs, the female keeps the embryos in the skin of her back until they can survive on their own?
According to the observationalists, it has been found that some varieties of frog show discrete behavior by holding their eggs on their back until they could survive on their own. This is a very specific and classical form of natural selection as explained below:
These varieties of frogs show a very low population density in early phase. This is because their eggs were mostly predated by other aquatic animals or amphibians. Slowly, some of these frog populations tended to protect their eggs by holding them against their body on their back. In this way, these frogs were not only capable of protecting their young ones from predation, but also tended to be selected for their ability to hold eggs on their backs as they showed a better survival. Thus, these varieties were naturally selected and still exist today.
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