What Are a Cow’s Horns Made Of?
What Are a Cow’s Horns Made Of? Cow horns, found in both sexes, begin growing soon after birth, wear continually, and do not branch. The h
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Keratin
What Are Toenails and Fingernails Made Of?
What Are Toenails and Fingernails Made Of? Fingernails and toenails are special growths of hardened skin cells. Most of the nail is made up
How Do Rattlesnakes Rattle?
How Do Rattlesnakes Rattle? At the end of a rattlesnake’s tail is a chain of hard rings linked closely together. When the snake is alarmed,
How Does My Hair Grow?
How Does My Hair Grow? Your hair grows out of tiny openings in your skin. These holes, which are too small to see, are called “follicles.” E
Why Do We Have Hair?
The main purpose of hair is to protect the body. Hair keeps the top of the head warm in winter, and shields it from bumps and bruises. The h