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When pollen grains are suspended in water and viewed through a microscope, they appear ...

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to?

A. convection currents
B. small changes
C. small changes in temperature
D. a chemical reaction between the pollen grain and water
E. the bombardment of the pollen grains by molecules of water




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