PKU
The specimen is placed on a microscope slide, and a thinner slip or cover placed on top.
it is where the specimen to be viewed is placed.
\to the stage
a piece of cork
That depends upon how the circles are located and the relationship between the numbers that are placed in the circles; unless the circles just happen to make a number, for example: .............. ..O.O.O.... ..........O.. ........O.... ......O...... ....O........ is a 7 regardless of what digits are placed in the circles.
The one you placed on the viewing plate.
a cover slip
That depends how the circles are placed on the page and what lines are defined between the circles.
human
yes
Cover slip
In the middle of the triangle