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Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?