[Solved] Which of the following rules is correct? A) Increases in assets are credits. B) Increases in expenses are credits. C) Increases in equity are credits. D) Increases in liabilities are debits. Microscopic Organisms: Tiny life forms, not visible to the naked eye, including bacteria, protozoa, and certain types of fungi and algae. Calcium Carbonate: A chemical compound with the formula CaCO3, found in rocks such as limestone, chalk, and marble, and is a major component of shells of marine organisms, snails, and eggs. Chalk Formation: A type of soft, white, porous sedimentary rock composed mainly of calcite or aragonite, formed from the skeletal remains of microorganisms. Microscopic Organisms: Tiny life forms, often single-celled, that can only be seen with the aid of a microscope.