Question

reasons why electron microscope can only observe dead specimens

Answer 1

Answer:

One thing you may not be aware of though, is that all the creepy crawlies in such images are dead. That's because the particle beam of electrons used to illuminate a specimen also destroys the samples, meaning that electron microscopes can't be used to image living cells

Answer 2

Answer:

It is not very advanced and an electron microscope is much more advanced.