Question

Why didn't Alexander Fleming see the mold spore fall into his Petri dish?

A.
It had never happened before, so he didn't check the dish.

B.
The spore looked the same as the bacteria that were in the dish.

C.
The spore was too small to see.

D.
He was too busy to notice.

Answer 1

Mold spores are extremely tiny, about the size of dust particles. They exist just about everywhere -- you are most likely breathing in a few of them into your lungs right this second. It just so happens that a few penicillum mold spores got into Fleming's petri dish; who knows how or when.

Answer 2

so c.

Answer 3

yea

Answer 4

ok thanx