Question

if a large number of producers, such as algae and microorganisms, were removed from an ecosystem, what would be the most likely consequence for the consumers?
the consumers would not be affected because they do not eat microorganisms.
the consumers would learn to make their own food through photosynthesis.
the producers would grow larger because there are fewer consumers.
the consumers would have less available food because their energy source is connected to producers.

Explanation:

Producers, such as algae, are the base of the food chain as they make food through photosynthesis. Consumers rely on producers for food. If a large number of producers (like algae) are removed, consumers would have less available food because their energy source (producers) is reduced.

Answer:

The consumers would have less available food because their energy source is connected to producers.