When new oceanic crust is made, it spreads out, taking up space. Scientists did not understand how new crust was not increasing the size of Earth.
Now that white moths don't have good camouflage in the trees, which have become dark with soot and made the moths easier to be seen, this change would decrease the population of the white moth because more predators will be able to see and eat them.
From this we can conclude that the human digestive system does not produce enzymes that can break down cellulose. The correct option among all the options that are given in the question is the fourth option or the last option. I hope that this is the answer that has come to your desired help.
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