<span> It could be weight loss, decrease in muscle mass, changes in hair or skin, diarrhea, extreme fatigue, difficulty recovering from infection or injury, enlarged liver, edema, drop in blood cell number, and frequent colds.
</span>
I think its false because gas exchange can happen in blood also
Your answer would be Retrovirus
Any molecule with a negative or a little positive charge is one of the substance that is involved with hydrogen bonding.