The study of embryonic development is used as evidence for evolution because:
A. DNA molecules are similar in closely related species.
B. closely related species can have very different kinds of embryos.
C. ancient ancestors of organisms looked like their embryos.
D. closely related species have embryos with homologous structures.

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Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?