The type of rock that is made of tiny bits of animal shells is ; (D) Limestone
Limestone is a type of sedimentary rock that is composed mainly of calcium carbonate and some other constituents such as; clay, quartz , iron carbonate and some fossil animal shells in microscopic forms.
Limestone is a raw material used mostly for the manufacture of building materials such as cement and can also be used for the production of other materials as well.
Hence we can conclude that the type of rock that is made of tiny bits of animal shells is Limestone
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