NCERT Important Questions Class 9 Science biology Chapter 13
Important NCERT Extra Questions
Chapter 13 Why do We Fall ill
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
(a) Who discovered “vaccine” for the first time? (b) Name two diseases which can be prevented by using vaccines.
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(a) Edward Jenner;
(b) Tuberculosis (T.B.) and polio or tetanus and diphtheria.