Anemones and corals are restricted to shallow waters because they usually grow in the region of the euphotic zone where sunlight is easily available to perform photosynthesis.
Corals may be defined as a structure composed of skeletons present in colonial marine invertebrates known as Coral reefs.
Corals and anemones require sunlight in order to survive. Hence, they live in the upper zone (euphotic zone) of the water bodies. If they allow growing in the benthic zone, they never survive due to the absence of sunlight.
Therefore, it is well described above.
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