Biology

The correct answer is B.Availability of oxygen in the water.

This is an abiotic factor because oxygen is a non-living component of the environment that influences the health and survival of aquatic organisms, such as fish. The amount of dissolved oxygen in the water directly affects the ability of fish to breathe and carry out cellular respiration, which is crucial for their survival.

Let’s break down the other options:

A.Predation by birds is a biotic factor because it involves interactions between living organisms (fish being preyed upon by birds).

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