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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The blood then travels to the <span>open tricuspid valve. </span>
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Answer:
The heads (the phospho part) are polar while the tails (the lipid part) are non-polar.Its like a front and back type of location with those.
Answer:
2 because the central nervous system includes the brain, cerebellum, cerebrum, brain stem, etc.