At area 1 ,a stream empties into the ocean . at area 2,precipitation enters the ocean in the form at rainfall area 3 ,evaporation takes place at the ocea's surface in which area's does the salinity of the ocean decrease.

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )