Tuberculosis vaccines are vaccinations intended for the prevention of tuberculosis. Immunotherapy as a defence against TB was first proposed in 1890 by Robert Koch. Today, the only effective tuberculosis vaccine in common use is bacilli Calmette-Guérin, first used on humans in 1921.
A <u>desert</u> receives less than 10 inches, or 25 centimeters, of precipitation a year.
During swallowing, the air passageway of the phaynx is covered by the epiglottis
Answer:
b
Explanation:
they are fighting for the same things so it would be competition
