Question

How do aquatic animals obtain oxygen?A. They separate oxygen from hydrogen in water molecules.B. They breakdown seashells and other organic materials.C. They filter the water for dissolved oxygen.D. They weather sediment to release oxygen.

Answer 1

Aquatic animals obtain oxygen from the oxygen dissolved in water. The water contains two hydrogens and one oxygen molecule, they thin walls of gills filter the water to obatin the filtered dissolved oxygen so the aquactic animals can breath. Therefore, the answer is C. They filter the water for dissolved oxygen.