Answer: Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
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Answer: D
Explanation:
A change in the amount of polar ice will alter how ocean currents move
So we can easily classify animals and distinguish their relationships
The answer is C) researchers employed by the environmental protection agency
Is there supposed to be an image?