Wings of bats are a Plesiomorphic ancestral feature for mamm

Wings of bats are:

a. Plesiomorphic (ancestral) feature for mammals

b. Plesiomorphic feature for bats and birds

c. Synapomorphic (shared-derived) feature for vertebrates

d. Synapomorphic feature for bats

e. Synapomorphic feature for bats and birds

Solution

It is a synapomorphic feature for all bats. Option (d). A synapomorphic trait is a trait that is detvied from a common ancestor and is a one that distinguishes a clade from the other. So here, wings of bats are derived from its common ancestor, and its structure clearly differentiates bats from other clades.

Note that wings of bats and birds though perform the same function, are structurally very different from each other.