3. One example of a piece of evidence for evolution is the presence of vestigial structures. Which of these is an example of a vestigial structure?
A Humans, penguins, and crocodiles all have a humerus bone in their arm.
B
The DNA of humans and primates is very similar
С
In humans, the appendix is shrunken and no longer necessary for survival
D. Peacocks will grow large and bright feathers to attract mates