Algae → water flea → small fish → big fish use the food chain to answer the question. what would most likely happen to the population of the water flea if the algae decreased? a) it would increase. b) it would decrease. c) it would not change. d) it would first increase, then decrease.

B) It would decrease.

Explanation:

According to the food chain, the algae represents the producer, the water flea represents the primary consumer, the small fish represents the secondary consumer while the big fish represents the tertiary consumer.

If the population of the producer (the algae) decreases, this will directly limit the amount of food available to the primary consumer (the water flea). The food limitation will lead to a reduction in their population.

Hence, the correct option is B.

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