single-celled organisms that live in the tissue of corals and provide energy to the corals (M2)

plankton composed of tiny animals (M2)

pathways and levels through which nutrients and energy flow between organisms (M2)

predators that feed on secondary consumers and comprise the fourth trophic level of marine food webs (M2)

carnivores; animals that eat primary consumers and comprise the third trophic level in marine food webs (M2)

the plants that form the first trophic level in marine food webs (M2)

herbivores; animals that eat algae and comprise the second trophic level in marine food webs (M2)

tiny organisms that float freely through the ocean or freshwater (M2)

plankton composed of microscopic plants (M2)

formation of carbohydrates in the chlorophyll-containing tissues of plants and corals exposed to light (M2)