Water obtained from natural resources does not show neutral ph. what is the reason behind this?

Why is excretion necessary to maintain homeostasis?

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

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph