Which three factors limit descriptive and comparative investigations? A. The way you must write hypotheses
B. The number of observations you can make
C. The amount of time or money required
D. The features of objects that you cannot see
E. The number of variables you can have

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that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

prndulum needs thread, weight clock to time swings