Which is an example of a chemical defense in your skin? growing long hair shredding dead skinsweating palmsdeveloping calluses

The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.

sweating palms because sweating is a natural way of cooling down, and releasing excess salt. Too much salt is really bad for your skin.