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The central core of the hair is called the...?

• Medulla
• Cuticle
• Cortex
• Shaft

Hair is helpful in solving old crimes because…

• hair on a suspect never changes
• hair always contains DNA evidence
• hair takes little room to store in evidence closets
• hair does not easily decompose

The tough clear outside covering of a hair shaft is

• cuticle
• cortex
• medulla
• polymer

The middle layer of a hair shaft that contains pigment

• the cortex
• the medulla
• the cuticle
• the polymer

Hair always contains DNA

• true
• false

In the diagram the cortex would be indicated by the letter

• A

• B

• C

What is the protein that hair is composed of?

• keratin

• glycerin

• catagen

Which of the following is/are function(s) of hair?

• Regulate body temperature
• Protect the skin from sunlight
• Decrease friction
• All of the above