The video provides a brief introduction to reefs, specifically focusing on coral.

What is a reef primarily composed of?

• Sand

• Rocks

• Coral

• Seaweed

Which of the following is a key component of a reef?

• Shells

• Coral

• Fish

• Algae

What natural structure is often associated with coral?

• Mountains

• Reefs

• Deserts

• Forests

Which marine organism contributes significantly to the formation of reefs?

• Dolphins

• Coral

• Jellyfish

• Sea turtles

What is the primary role of coral in marine ecosystems?

• Building reefs

• Producing oxygen

• Providing food

• Filtering water