水跟人類,,水中生物跟生態系統有甚麼關係?

water and human:

Human body contains about 70% of water, as cells survive in a water medium. If there is not enough water, the cells will die and we can't survive.

Water make up large percent of the blood, and blood is essential for providing oxygen and nutrients to cells.

Water can keep our body temperature more or less stable. We can loss heat via sweating, forming urine etc.



Aquatic organisms and ecosystem:

Algae in water produce oxygen in the aquatic ecosystem via photosynthesis. Without this, all aquatic organisms will die.

There are complex food webs in the aquatic ecosystem, phytoplankton --> zooplankton --> crustacean / small fish --> large fish etc. And human also consume a lot of organisms in the water.