Aquatic organisms have only a predatory relationship with coral reefs.
true or false

False

Explanation:

There are organism that have symbiotic relationship with coral reefs for example:

Inside coral polyps live and algae called zooxanthellae, they provide oxygen and other nutrients to the coral. They also protect the coral from sunlight. The coral provide carbon dyoxide necessary for photosynthesis.

Sponges and anemones are inhabitants of coral reef.

Many worms have their home within the cracks of the coral, in this place they are safe from predators.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)