Why do fish need to eat other organisms ?

Hello There!!

Explanation:

They are important as food, shelter and also produce oxygen as a byproduct of photosynthesis, which fish and other aquatic organisms need to breathe underwater. The next step includes the zooplankton and aquatic insects. ... Some aquatic insects also eat algae, while some are predators and eat other insects or zooplankton.

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~Pinky~

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

10 years is the answer