OK so basically you use a compound light microscope to observe specimen so if you were trying to find micro organisms that would be the one to choose.
A bad attitude or strange behavior different to what they normally display.
Explanation:
A thermos flask has double walls, which are evacuated and the vacuum bottle is silvered on the inside. The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection.
I think it’s b. So choose that
