The is (are) the organ in which the exchange of nutrients and waste takes place

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

What is the major difference between a virus and a viroid?

2.) insulin is needed to your cells take in sugar from your blood. after you eat a candy bar, will your insulin gene be expressed or repressed? 3.) all cells have the same dna, and they all make the same proteins. true or false? the answers are 2.) expressed3.) false