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Assessment
What is the primary role of coral reefs in marine ecosystems?
They provide a habitat for a diverse range of marine species.
They are the main source of commercial fishing.
They can evolve into land structures.
They have no significant role.
What percentage of the world's marine species depend on coral reefs at some point in their life cycle?
About 25%
About 50%
About 75%
About 90%
What is one major threat to coral reef ecosystems?
Coral bleaching due to rising sea temperatures.
Increased fish populations.
Higher oxygen levels in the ocean.
Reduced salinity in the water.
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