Check all that commonly occur in the skin during aging.
collagen fibers in the dermis decrease in number
sweat gland activity increases
reduced activity of skin stem cells
melanocyte numbers increas

Collagen fibers in the dermis decrease in number  and Sweat gland activity increases

Explanation:

Aging is an inevitable phenomenon in humans. Aging has significant affects on the human skins.

The skin is loosened and a lot of wrinkles can be seen on the face and other body parts. This occur's mainly because of two reasons that are Collagen fibers in the dermis decrease in number  and Sweat gland activity increases

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.