Prions are composed of
a. dna, rna, and protein.
b. protein.
c. dna and protein.
d. rna.
e. dna.

The best answer is B.

Prions are an abnormal form of protein that  has been genetically encoded.

They have no nucleic acid and are therefore very different from  viruses, bacteria, fungi and other pathogens. They are quite resistant to procedures that break down nucleic acids and destroy biological forms of pathogens.

Prions cannot reproduce but they replicate by stimulating normal cellular prion protein to refold into an abnormal  form called PrP Scrapie.

Prions are extremely small, even smaller than viruses.

the median of the data is 4.5.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.