To organize this text, the author divides it into sections with subheadings. what contrast does the author make in the section with the subheading “look, ma, no cavities! ”?

In the article titled “Human Microbiome: The Role of Microbes in Human Health” and within the section titled “Look, Ma, No Cavities!” the author makes a couple of contrasts.  The first contrast the author makes is between harmful streptococci and benign streptococci (some of which actually combat harmful strains to the benefit of the person.

the correct answer is (a); the angles, saxons, jutes, picts, and celts

explanation: