PICAT Test Study Guide | 120 Questions with 100% Correct Answers | Verified | Latest Update 2024

Which of these is the best explanation of how a smooth round stone became smooth? - It was in a stream for a long time. In a balanced aquatic ecosystem, what would have the greatest population? - Plankton Any astronomical body that revolves around a larger body is called - A satellite In chemistry, to be classified as an organic substance, a substance must contain - Carbon atoms what element does not contain any neutrons? - Hydrogen The chemical formula of a compound describes the elements the compound contains and the ...... - Ratio of elements in the compound. What is the symbol for the hydroxyl ion? - OHThe tympanic membranes are also know as the... - Ear drums what would produce a chemical change? - Adding salt to the hot water Choking is prevented by the.... - Epiglottis covering the voice box