Gap Filling Quiz

Fill in all the gaps by choosing the correct answer from the dropdown menu
Each word is to be selected only once
Then press the Check button to see your result
agar280.pngThese are organisms too small to be seen with the naked . They may be viewed using a .
They are found almost everywhere and can be both and beneficial to humans. Although extremely small, these microbes come in many different and sizes. There are main groups of microbes: bacteria, and viruses.