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Explanation:

To measure large distances in the universe astronomers have coined a technique called 'cosmic distance ladder'. It is basically a succession of different methods applied in accordance to distances between objects.

prokaryotic cells do not have a nucleus in which the dna is stored in, it floats freely inside the cell.

eukaryote cells do have a nucleus in which the dna is stored in.

the correct answer is:

a population changes in response to a change in the environment.