What are the characteristics of potable water? (drinkable water)

Models are non-visual ways of coummincating how someone thinks about something in the natural world

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?