About how many cells are in the human body? This sounds like a complex question, but you can make a pretty good estimate with a little bit of background knowledge and what you have learned thus far!

First, we assume that a cell is a sphere with a radius of 0.001 cmand that the density of a cell is approximately the density of water, which is 1 gram/cm³.

1. What is the volume of one cell?

1. What is the mass of one cell? {Recall: density = mass/volume)