If there is a change in the sequence of a dna molecule, it may cause a different

DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.

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Explanation:

Got this from DNA Is Constantly Changing through the Process of Mutation

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle