Why are the lungs made up of these progressively smaller tubes and then

millions of tiny alveoli rather than each

lung just being a large empty sack?

Give an example of a trait that is controlled by more than one gene.

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen

What’s the student’s scientific question