GEOLOGY

Detailed explanation-1: -Marine cnidarians Cnidarians include corals, sea anemones, jellyfish and hydrozoans. They form a phylum containing over 10, 000 species of animals found exclusively in aquatic (mainly marine) environments.

Detailed explanation-2: -Invertebrates are the most diverse group of animals in the ocean. Some common marine invertebrates include mollusks, crustaceans, and corals. Mollusks are a category of invertebrates with over 50, 000 known species.

Detailed explanation-3: -Making up over 92% of life in our oceans, marine invertebrates inhabit every zone in the water column, with contributions ranging from ecosystem functioning to socioeconomic development.

Detailed explanation-4: -They represent the vast majority of marine biodiversity and include, for example, sponges, corals, bluebottles, worms, shells, sea urchins, starfish, crustaceans, sea cucumbers and nudibranchs. Their size ranges from tiny microscopic organisms to several metres in length, and they have an amazing diversity of form.