It is a single layer of cube-shaped cells. New epidermal skin cells, called keratinocytes, are formed in this layer through cell division to replace those shed continuously from the upper layers of the epidermis. This regenerative process is called skin cell renewal. As we age, the rate of cell renewal decreases.
Primates - marmosets, monkeys, apes, lemurs, humans. There are about 233 species in this order. Primates range in size from the tiny pygmy marmoset that weighs less than 3 ounces to the large mountain gorilla that weighs close to 400 pounds.Most species of primates are found in subtropical or tropical forests and many species live in trees. Primates have five fingers on their hand and five toes on their feet.
The smallest and largest monkeys, a Pygmy Marmoset (left) and male Mandrill (right). 1  The Pygmy Marmoset is the world s smallest monkey. 2  It measures 117-159 millimeters (four and a half to six inches) in length and weighs 85 to 140 grams (three to five ounces).