REPTILE MAMMAL Epidermis covered with scales Epidermis covered with hair

Ovary (birth) fetus (a young mother develops in pediatrics) placenta, birth

Cranial skull, enlarged skulled skull, several bones that form the mandible single osteogenesis jaw

Teeth are constantly replacing two sets of teeth (deciduous and simple cheek teeth are permanent), complex cheeks

The limb walks are standing upright and the body's height is right under the limbs.

Hair is a decisive feature of all mammals. Reptiles do not have hair, but they have scales Unlike scales of fish, they appear not on the underlying dermis but on the upper layers of the skin, the epidermis. Hair and scales are made of substances called keratin. Mammals also have sweat glands, but reptiles do not

Except for polar regions, there are reptiles everywhere, and vertebrates are like mammals. Reptiles are covered with scales, but they are not hair. They also produce eggs that their baby hatches and continues to grow throughout their lifetime even during adulthood. Their hearts have only three rooms instead of four rooms of mammals, and their teeth are constantly being exchanged - no restriction! Unlike mammals, reptiles are sensitive to body temperature, so you can not adjust the temperature inside the body (outside means "outside"). Instead, they must use the environment (really, the sun). They run around in the warm weather after eating during the day and get cooler when they go to bed at night. Think about it, when you feel warm, you feel more energy than you have when you catch a cold.

The epidermal epidermis is made up of stratified squamous epithelial tissue. Epithelial tissue covers the inner and outer surfaces of the body and forms glandular organs. Squamous epithelial cells are as thin and flat as fish scales. Hierarchization means that there are simply two or more layers. Briefly, the epidermis consists of a thin flat cell layer that fits closely together to resist abuse and rubbing. The epidermis can be divided into 4 layers or 5 layers. The most important of these is the inner and outer layers. The inner or deepest cell layer is the only layer in the epidermis that receives nutrients (from the underlying dermis). This cell layer called basal cell divides everyday to create new cells and pushes out old cells to the surface. Basal cells produce keratin, which is a very durable and waterproof fibrin