[Answer] 1. Which part of the human body is made from a toughened protein called keratin and usually features a prominent white-coloured area known as the "lunula"?

Step 1 : Introduction to the question "1. Which part of the human body is made from a toughened protein called keratin and usually features a prominent white-coloured area known as the "lunula"?"

...1. Nose 2. Nerve endings 3. Nostril hair 4. Nails Like animals' horns and hooves, human fingernails and toenails are made from a tough protein called keratin. Nails found on humans and other primates evolved from the claws of earlier animals. The "lunula" is the white crescent-shaped area of the nail which sits at the base of the nail, against the finger. Changes in the colour of the lunula can indicate certain health issues. For example, the area might take on a blue tinge in a patient suffering from silver poisoning, or possibly turn red where a patient suffers from heart disease.

Step 2 : Answer to the question "1. Which part of the human body is made from a toughened protein called keratin and usually features a prominent white-coloured area known as the "lunula"?"

Nails:

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