Question

II. Fill in the blanks:
1. Dissolved
in water is used by aquatic
organisms for respiration.​

Answer 1

Answer:

oxygen is the right answer..

Explanation:

hope it helps you..

Answer 2

Answer:

Aquatic animals use oxygen gas dissolved in water to respire.

The oxygen dissolve in marine water by diffusion from the surrounding air; aeration of water that has tumbled over falls and rapids; and as a waste product of photosynthesis. This dissolved oxygen is then used by marine animals for respiration.