Which of the following diseases is always caused by a bacterial infection?

a. hiv
b. leukemia
c. diphtheria
d. smallpox

What are four key elements of the study of economics?

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

The third stage of cellular respiration is (2 points)