Animal skin is the answer
Cerebral palsy-<span>Symptoms include exaggerated reflexes, floppy or rigid limbs, and involuntary motions.
alzheimer's disease- </span><span>A progressive disease that destroys memory and other important mental functions.
parkinson's disease- </span><span>Parkinson's often starts with a tremor in one hand. Other symptoms are slow movement, stiffness, and loss of balance.
THE ANSWER IS B (:</span>
Swelling is a sign because when you swell up then you know theres something wrong
Human Papilloma virus { hpv } is an STI which is likely to have a strong link to cancer because the virus transfer from skin to skin