Question

which type of microscope is used to observe living or preserved specimens
transmission electron microscope
compound light microscope
scanning electron microscope
dissecting microscope

Explanation:

A compound light microscope can be used to observe both living and preserved specimens. Transmission and scanning electron microscopes require specimens to be prepared in a vacuum - which is not suitable for living specimens. A dissecting microscope has lower magnification and is often used for larger specimens or for dissection work rather than detailed observation of cells in living or preserved specimens.

Answer:

B. Compound Light Microscope