Alexander Fleming
Edward Jenner
Jonas Salk
Robert Koch
Louis Pasteur
Correct answer is C
Jonas Salk developed the first effective polio vaccine in 1955.
What is the primary diet of a koala?...
Who is the founder of the outdoor apparel company North Face?...
What is the name of the layer of gases that protects Earth from the Sun's ultraviolet rays?...
How do you report a fake account on Instagram?...
Which document serves as the supreme law of a country?...
How can you keep your fridge smelling fresh?...
What is the birthdate of Elon Musk?...
How do you block someone on Twitter?...
Which company manufactures the Galaxy Tab?...
What is the name of the spaceship in the "Star Trek" series?...