There are three main layers of human skin and each has its own function and parts. The epidermis layer is the outermost layer of skin and is the part that can be seen. Its main function is for protection. Deep inside the epidermis layer, there are growing cells, and, on the outside, there are flat, dead skin cells that easily flake off the body. In fact, every minute of the day, a person loses about 30,000 to 40,000 dead skin cells or. gist summary and talk back
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Photosynthesisthe process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.

See how growing plants react to different conditions of light, temperature, or carbon dioxide concentration.

Na+ loss through sweet plus the dilution has lowered na+ concentration outside of neurons, altering the na+ equilibrium potential. sodium exists more outside the cells than inside. when na+ is lost by sweat plus the dilution( because they drink a lot of water) changes the concentration outside the cell, forcing the water to enter the cell and attempt to balance the concentration inside/outside.the problem is that the abundance of water will cause the cells to swell. most cells can adapt, however, the brain cells can't that's why the runner has confusion and can't control the muscles.  if not treated and this occurs in less than 48 hours, it can be immediately fatal .

The  pelagic  region is divided into three zones. the top zone is the euphotic or sunlit zone. this is the ocean zone that sunlight penetrates. because this zone gets sunlight, photosynthesis can occur and plants can grow here.sub  zones. the oceanic zone is subdivided into the epipelagic,  mesopelagic, and bathypelagic zones. the epipelagic (euphotic) zone, also called the sunlit zone, receives enough sunlight to support photosynthesis.your question does not include multiple choice,but i can give you some info on what the 3 zones hope this : -)