[Solved] What ground rules help to maintain control, avoid heated exchanges and prevent one or two people from dominating the questions period before your presentation? A) Insist that all questions be taken on notice B) Appoint somebody to ask pre-prepared questions C) Try to ignore the people who are dominating and invite questions from others D) Announce a time limit for the question period and a question limit per person Sea Level: The average height of the ocean's surface between high and low tide, used as a reference point for measuring elevation or depth. Calcium Carbonate: A chemical compound with the formula CaCO3, found in rocks such as limestone, chalk, and marble, and is the main component of shells of marine organisms. Chalk Formation: A type of limestone characterized by its fine, white, porous structure, formed from the accumulation of microorganisms' calcite shells. Microscopic Organisms: Tiny life forms, not visible to the naked eye, including bacteria, protozoa, and certain types of fungi and algae.