Question

this diagram shows a food chain from lake superior, a freshwater ecosystem on the border of the united states and canada. the sludge worm is an herbivore. why? it hunts and eats a primary consumer. it eats a producer. it makes its own food.

Explanation:

Herbivores are organisms that eat producers (plants or algae in this case). Macroalgae are producers. The sludge worm eats macroalgae (a producer), so it is an herbivore. The option "It eats a producer" is correct. The option "It hunts and eats a primary consumer" would make it a secondary consumer (not an herbivore). The option "It makes its own food" would make it a producer (not a consumer at all).

Answer:

It eats a producer.