The hardest part of the animal body is

Options

A. Bone
B. Har
C. Dentine
D. Enamel

Answer

To solve the question "The hardest part of the animal body is," we will analyze the given options one by one:

1. **Option A: Bone**
- Bones are indeed hard structures in the body and provide support and protection for organs. They are composed mainly of collagen and mineral salts, primarily calcium phosphate. However, while bones are hard, they are not the hardest substance in the body.

2. **Option B: Hair**
- Hair is made of a protein called keratin. While it can be somewhat strong, it is not considered hard compared to other structures in the body. In fact, hair is relatively fragile and can break easily.

3. **Option C: Dentine**
- Dentine is a calcified tissue that makes up the bulk of a tooth and is found beneath the enamel. While it is hard, it is not as hard as enamel. Dentine is less mineralized than enamel and is more susceptible to decay.

4. **Option D: Enamel**
- Tooth enamel is the outermost layer of a tooth and is known to be the hardest substance in the human body. It is composed mainly of hydroxyapatite, a crystalline calcium phosphate. Enamel protects the teeth from decay and damage, making it the hardest part of the animal body.

After analyzing all the options, we conclude that the hardest part of the animal body is:

**Correct Answer: Option D - Enamel**