What two structures on the microscope will you use to focus on your specimen

First, set the diaphragm to the most open setting. Then, after the speciman is placed in the stage, the coarse adjustment is used to bring the object into view. The fine adjustment is used to make the image clearer.

The atmosphere wasn’t strong enough to contain more oxygen when compared earths atmosphere today, the exosphere was full of rips and couldn’t contain enough oxygen to provide for land creatures, although aquatic earthlings could continue i exist in this environment

Bis the correct answer.