Gizelle15
contestada

In the early 1950's dr Jonas Salk developed an effective vaccine for what childhood disease
A) polio
B)Measles
C)chicken pox
D)typhoid fever

Respuesta :

A) Polio. But you can also choose D if you don't think A is correct.
KaraWheeler67
In the early 1950s Dr. Jonas Salk developed a vaccine for A) polio

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