The only difference would be in the quality of image you could see. The microscopes with higher magnification could make the specimen larger and creates much clear view.
When new inventions arose, while many toxins have been around for centuries, the largest boom was the industrial revolution.
The answer is B.)Capillaries
Exchange of Gases, Nutrients, and Waste Between Blood and Tissue Occurs in the Capillaries. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells. In the lungs, capillaries absorb oxygen from inhaled air into the bloodstream and release carbon dioxide for exhalation.
(Don’t know if you wanted all that)