- 1. At what magnification do you first notice the ragweed pollen?
- 2. Which is bigger, a rhinovirus or E. Coli?
- 3. Based on the magnification, how many of the E. Coli can fit into the same space as the head of a pin?
- 4. About how many red blood cells could fit across the diameter of a human hair (again, look at the magnification scale)?
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