Answer: Yes the ozone layer sits at the top to protect us from harmful UV rays from the sun.
Explanation:
Answer:
The heart beat's 80 times a minute, about 115,000 times in one day or 42 million times in a year
Explanation:
Answer:
The receptors are like locks and the keys to open these locks are the odor molecules that float past, explains Leslie Vosshall, a scientist who studies olfaction at Rockefeller University. People have about 450 different types of olfactory receptors.
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Are effective for individualized training and for classroom training.
all of the other answer seem unnecessary!!
