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C.  A car traveling at a constant speed and stopping to refuel

D. A roller coaster traveling down a hill and climbing the next hill.

Explanation:

The line that's going down represents the roller coaster going down, and the line going up represents the roller coaster climbing the hill.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

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.