Posted: November 1, 2016
http://www.sciencekids.co.nz/gamesactivities/microorganisms.html
https://www.brainpop.com/games/microbes/
http://www.topmarks.co.uk/Flash.aspx?s=living-things/microorganisms
cellsalive.com/howbig.htm
You may also search for more microorganism online activities