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amphibians: The class of vertebrates that contains the frogs, toads, newts, and salamanders.
adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment.
Also used to describe the process of genetic change within a population, as influenced by natural selection.
adaptive landscape: A graph of the average fitness of a population in relation to the frequencies of genotypes in it.
amino acid sequence: A series of amino acids, the building blocks of proteins, usually coded for by DNA.
Exceptions are those coded for by the RNA of certain viruses, such as HIV.