How do corals form their skeletons?

A coral reef is formed when the calcium carbonate skeletons of dead corals serve as the foundation upon which layers of successively younger animals attach themselves.

Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically live in compact colonies of many identical individual polyps. Corals species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.

human didn't come from monkeys man i hate these stupid teachers

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.