Subject: How can you tell that a cell has depth or thickness?

In my Biology class, we have to observe cells under a microscope and 
explain them. I wanted to find out as much as I could about cells, while 
observing them under a microscope, and I have a lot of information, I just 
have one parcticular question that I would like to know, but can't find 
out about a cell. How can you tell that a cell has depth or thickness when 
observing it under a microscope? It's really hard to tell, beacuse you can 
only look, and not touch. So how can you REALLY tell?

Re: How can you tell that a cell has depth or thickness?