A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.
A. The cat is leading the dog into a trap.
B. The dog is smelling molecules from the cat.
C. The dog is following the areas of increased density of the Earth.
D. The dog is smelling atoms from the cat.
Answer: B
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