The nephrons. the nephrons are composed of the glomerulus, proximal convoluted tubules, loop of Henle, distal convoluted tubules, and the collecting duct
Answer:
mold
Explanation:
Alexander Fleming was a Scottish physician and scientist. He was known for the development of penicillin.
Alexander Fleming discovered a type of <u>mold</u> that kills bacteria, which led to the development of Penicillin.
The mold created around itself a bacteria-free circle.
Fleming experimented further and named the active substance penicillin.
The most accurate response would be between A and D.