. and are early tetrapods that do not have features unique to fish. Describe how these two species differ anatomically and what that means about where they each lived.

Choose the best definition of allele. a. one of several possible versions of a gene, which each produce a different phenotype b. an organism that's purebred for a given trait c. the process of fertilizing a plant with pollen from another plant d. a set of genes that are located on the same chromosome and so are tightly linked