Photosynthetic activity of the algae is vital to the survival of the coral animals, which use the energy to extract calcium from the seawater and
build their calcareous skeletons. The zooxanthellae are protected by the hard coral
and obtain plant nutrients from the coral.

the aswer is letter c

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

there really is life in the deepest part