Some animal species found in caves have tiny, nonfunctional eyes. These are best described as
A) homologous structures.
B) vestigial structures.
C) analogous structures.
D) mutations.

Question

Quizplus · Accepted Answer

Vestigial structures are remnants of organs or structures that had a function in an early ancestor but are now reduced and/or nonfunctional in a later species. The tiny, nonfunctional eyes in some cave-dwelling animals are examples of vestigial structures, as these eyes may have been functional in the species' ancestors who lived in environments where sight was necessary.

Some Animal Species Found in Caves Have Tiny, Nonfunctional Eyes