1. This document discusses different types of scientific investigations including descriptive, classificatory, and experimental investigations. It provides examples of each type and describes key aspects like variables, hypotheses, and data collection. 2. Specific investigations described include determining factors that affect the speed of a pendulum clock and observing what happens when M&Ms are placed in water. Variables that could be manipulated and questions for further study are outlined. 3. Dissolving of M&Ms in water is explained due to the polar nature of water molecules being attracted to polar molecules like sucrose in the candy coating.