Help please ;-; asking again---

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Were you able to observe the nucleolus in any of the cells if so which ones

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.