From the question you can immediately infer that it's either B or D, as A and C basically mean the same thing and it isn't anything related to a microscope. I can tell you now that you don't need an electron microscope to see cells, they're only required for the atomic level.
Therefore, the answer is B, as you can't see cells without a microscope but you only need a light microscope, not an electron microscope.
Answer:
pepsin would either work at extremely slow pace or get denatured.
The ecosystem is changing makingt it easier for people to live
B. Cloning because the selections don’t make sense
<em>Answer:</em>
<em>Which phrase describes one characteristic of radioactive elements isotope</em>
