Question

which organism would be considered a tertiary consumer?
seaweed
clownfish
whale

Explanation:

Tertiary consumers are at the fourth trophic level. Seaweed is a producer (first trophic level). Clownfish is a primary consumer (second trophic level). Whale is at a higher trophic level, consuming secondary consumers (like tuna, shark etc. which are at third trophic level).

Answer:

whale