Question

What helps fish to use oxygen dissolved in water.

Answer 1

for respiration and gills uptake oxygen to carry out respiration i.e. breakdown/oxidation of food

Answer 2

Answer:

Explanation:

It is essential for the survival of fish and other aquatic organisms. Oxygen dissolves in surface water due to the aerating action of winds. Oxygen is also introduced into the water as a byproduct of aquatic plant photosynthesis. When dissolved oxygen becomes too low, fish and other aquatic organisms cannot survive.