Humans Share Several Features with Salamanders

Multiple Choice

Humans share several features with salamanders.Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species' early embryos are very similar; and where the salamander has a functional tail,humans have a vestigial tailbone.In evolutionary terms,these are examples of

A) adaptation by natural selection.
B) biogeographic similarity.
C) coincidental similarity.
D) homology.