3. When creatures have similar traits, what does that tell you about them?

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.

As scientist had investigated evolution from a variety fields they have found

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?