The term used by leeuwenhoek for cell

answer:

animalcules (tiny animals)

today we call Leeuwenhoek's animalcules bacteria

answer:

The central nervous system includes the brain and spinal cord, while the peripheral nervous system includes all of the nerves that branch out from the brain and spinal cord and extend to other parts of the body including muscles and organs.

Explanation:

In order for us to identify specimens more efficient because the main function of the microscope is to magnify an object or organism not visible by the naked eye and is achieved by its resolving power and focusing, while the other parts are the ones used in focusing, we must know how to utilize them correctly to ensure satisfactory results, less technical errors and less damage to the microscope