How do the oceans support life?

The ocean is able to support life the same way that our lives are supported on land, however sea creatures are accustomed to living in water.

Water does provide oxygen that is required for life to exist, however it is much less oxygen than is available in air.

Plants that exist in water use photosynthesis, just like plants on land, to acquire energy and use that energy to keep on growing. The simplest example of this is algae, which acquires oxygen molecules and also conducts photosynthesis to stay alive.

Fish survive by eating this algae and other organic matter, plant life or sea creatures that live under water.