Answer:
Adapted to conserve water.
Explanation:
Living on land means limited access to drinking water, so reptiles' kidneys have adapted. They conserve water by producing less urine in more concentrated forms.
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Generally, epithelial cells serve the function of protection of the inner layers of the structure they are on. The fact that these columbar epithelium and transitional epithelium cells have smooth walls and are dome shaped allows them to stretch. This stretching helps the bladder retain more urine than it would be able to if the epithelial cells were rigid.
A. the history is the moths that where white where able to blend in the trees before the pollution of the trees causing the trunks to turn black and the frequency of the blacks being seen to be more then the whites