Cystic fibrosis is a disease that
a. causes all those infected to live only into their teen years
b. makes it difficult to breathe
c. can be cured with proper medication
d. occurs most frequently in people of asian descent

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

b is the correct answer

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called