Will give brainliest a heating curve a. how the boiling point of a liquid changes over time b. how the freezing point of a liquid changes over time c. the phase change of a substance over time d. the chemical properties of a substance over time

Hey! The answer you are looking for today is D.

Here is why;

A heating curve graphically represents the phase transitions that a substance is undergoing as heat is added to it. The plateaus on the curve mark, the phase changes. The temperature remains constant during these phase transitions.

Hope I made your day a bit easier,

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chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.