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

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.