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. Biogeographic similarity
b. Coincidental similarity
c. Independently acquired characteristics
d. Homology – characteristics similar due to inheritance from a common ancestor