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

the endocrine system secretes hormones into blood and other body fluids. these chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. hormones provide feedback to the brain to affect neural processing. reproductive hormones affect the development of the nervous system.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.