19. What kind of interaction is shown when animals like crabs and mollusks help break down
plant litter in a mangrove ecosystem through grazing?
A. competition
B. commensalism
C. parasitism
D. mutualism
20. Why is producer important in an ecosystem?
A. It is the source of food to the consumers.
B. It is an organism that eats plants.
C. It breaks down organism into smaller particles.
D. It is a series of feeding relationship.




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