Where is most marine biodiversity found? 

A)  in tide pools 
B)  in salt flats 
C)  on coral reefs 
D)  on the deep ocean floor

Coral reefs are considered to be the most biodiverse marine ecosystem, as they support a wide range of plant and animal species. They cover only a small area of the ocean floor but are home to approximately 25% of all marine species. Tide pools and salt flats are also important ecosystems but do not have as high a level of biodiversity as coral reefs. The deep ocean floor is generally considered to have lower biodiversity than shallow water ecosystems like coral reefs.