Why do we need to drink water? / Why do we need food and water to survive?
Why do people die when they are old?
What is blood made of?
Why do we have fingerprints?
Where does food go after we eat?
Why is our hair black?
Hair color comes from melanin, the substance that gives hair and skin its pigment. The lighter someone's hair, the less melanin there is. A person with brown or black hair has much more melanin than someone with blond or red hair.
Why do we need air to survive?
Why do we need to eat vegetables?
How do we grow up?
Why do we need to eat healthy food?
How can food give us energy?
Why can't we breathe underwater?
Why do babies have jaundice?
Why do our fingernails grow long?
Why does our heart thump hard at times?
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