When an athlete participates in a sport, they use a lot of the water in their body (sweat). The body is 70% water, and muscles are made of mainly water. By drinking water and other fluids, they replenish the water that their body has/will used/use.
They use their gills.
your body is mostly water, and water is the medium by which nutrients and others chemical necessary for life are distributed within and between cells
They use their fins to power through the water
Food and water
Food, water, and gases
use their tales
It helps the body remove heat through sweating, and it also allows it to use water as an energy source.
reservoir
A body or rock or sediment that stores groundwater is called an aquifer. Water can be extracted by the use of a water well.
In the pool, or in any large body of water.
A reservoir.