If the total energy does not change, then why did the skater stop? *

The skater's total energy does not change (it remains the same as it was in the beginning) as he moves up the ramp. ... Potential energy was being used to get the skater to the bottom if the ramp. The skater's potential energy has been depleted at the bottom of the ramp, and is converted to kinetic energy.

Explanation:

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.