Which microscope did anton van leeuwenhoek use to observe single-celled organisms? simple microscope compound light microscope electron microscope tunneling microscope

Simple microscope

Anton van Leeuwenhoek in 1679 developed a simple microscope. He observed first living single celled organism under microscope. He observed pond water, soil-water mixture, a drop of hay infusion under microscope and found single celled living organisms like protozoa, bacteria.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

there is no stairs in bungalow

explanation:

poof