In biology, students often learn about the amoeba. The amoeba is a single celled organism that is known to cause severe cases of diarrhea. Most of these organisms are so small that you cannot see them. Even though they are so small, scientists have been able to actually measure them and list them ranging from 0.2 mm to 0.5 mm. What instrument allows the amoeba to be measured?
A) barometer
B) micrometer
C) telescope
D) thermometer