the human heart can be seen with the naked eye if chest is open
No...you could see cells with a microscope.
No, you need a florescent microscope to see that.
microscope
Understanding Microscope Objectives
what is something that scienists need a microscope to see
a compound microscope or an electronic microscope will do.
electric microscope
Electron microscope.
We need a microscope to see cells because they are too small to see without one.
You can see chloroplasts using a light microscope. See related link for proof.
you ca see in stage of microscope
electron tunneling microscope