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

Ecology can best be described as the study of what

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.

For which of the following ions is the intracellular concentration typically higher than the extracellular concentration? a. sodium b. calcium c. magnesium d. potassium e. chloride