What was the major advance made in microscopy in the 20th century?

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

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.

Agroup of organisms that changes over time is said to