Question

information on coral reefs , sponges and porifers

Answer 1

Coral reefs are diverse underwater ecosystemsheld together by calcium carbonate structures secreted by corals. Coral reefs are built by coloniesof tiny animals found in marine water that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps. Most reefs grow best in warm, shallow, clear, sunny and agitated water

.Sponges, the members of the phylum. Porifera(/pɒˈrɪfərə/; meaning "pore bearer"), are a basal Metazoa clade as sister of the Diploblasts.[1][2][3][4][5] They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. The branch of zoology that studies sponges is known as spongiology

Answer 2

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. About one-third of all marine fish species live part of their lives on coral reefs.

Though extremely plant-like in appearance, sponges are actually one of the most primitive animals in the sea. They belong to a group called porifera. 

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