To protect them from ultraviolet rays from the sun.
Mutations can lead to changes in the structure of an encoded protein or to a decrease or complete loss in its expression. Because a change in the DNA sequence affects all copies of the encoded protein, mutations can be particularly damaging to a cell or organism.
Plants, Animals, and bacteria
I believe that the correct answer would be Radioactive Dating of each layer because it give a precise age based on the amount of radioactive decay the rock releases over time
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Birds and reptiles lay amniotic eggs. They consist of a shell, embryonic membranes, and the embryo.
