written as a guide. Wie UNIC por un Across 2 AT OF EDUS 2. He used his improved compound microscope in 1665 and discovered tiny compartments in a thin slice of cork. 3. It is a precision instrument and commonly used tool by scientists in studying objects or organisms or even parts of organisms that are invisible or slightly visible to the naked eye. 4. He was the first to observe bacteria, yeasts, red blood cells, and described colonies of protozoans teeming in a drop of rainwater. Down 1.They started experimenting using lenses; they have made a very important invention compound light microscope. a BICO Not for sale