Question

read these two excerpts. what does the second excerpt add to the first? a it offers an example of a type of human microbiome. b it proves that humans do not have microbiomes. c it identifies how microbes make people sick. d it provides evidence that microbes are harmful. excerpt 1 one team of researchers at north carolina state university recruited 60 volunteers and their belly buttons. using swabs that resembled q - tips they wiped the belly buttons and got samples of the microbes present. they identified over 2,300 species. and not a single species was found in all belly buttons. the microbes differed from person to person - which means your own belly button is likely home to a microbiome thats totally unique to you. excerpt 2

Explanation:

The first excerpt describes a study on belly - button microbiomes. Option A is correct as the second excerpt likely provides more details or an example about the human microbiome, specifically the belly - button microbiome. Option B is incorrect as the text implies humans have microbiomes. Option C is wrong as there is no indication of how microbes make people sick. Option D is incorrect as there is no evidence in the given text that microbes are harmful.

Answer:

A. It offers an example of a type of human microbiome