Many factors determine the health of an aquatic ecosystem. which choice list only abiotic factors?

the oxygen content of the water, the water temperature, and the chemical composition of the bottom mud

Explanation:

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.