Respuesta :
Answer:
The correct answer is option D) "ecosystem".
Explanation:
An ecosystem is one of the most broad concepts used in Ecology. Ecosystem refers to a biological community, including its living and nonliving components and how they interact. All the components mentioned in this example are part of an ecosystem, including the fish, the coral reefs, the small organisms, the predators, the sand, and how they all interact to each other.