Question

19. The rate of hair growth is important to know because it can help determine the last time hair was

chemically treated. Human hair grows at which rate:
a. 1.3 cm per day.
b. 1.3 cm per month.
c. 1.3 cm per week.
d. 1.3 cm per year.
20. Animal hair and human hair have several differences including:
a. the cuticle type.
b. the medullary index.
c. the pattern of pigmentation.
d. All of these choices.
21. The central core of a hair fiber is called the
a. cortex.
b. cuticle.
c. keratin.
d. medulla.
22. Forensic scientists distinguish
a. two.
b. four.
types of hair on the human body.
c. six.
d. eight.
23. Hair proceeds through_____ stages as it develops.
a. three.
b. four.
c. five.
d. six.

Answer 1

Human hair grows at a rate of 1.3 cm per month and distinguishing between animal hair and human hair involves considering the cuticle type, medullary index, and pattern of pigmentation. The central core of a hair fiber is called the medulla, and forensic scientists distinguish two types of hair on the human body. Hair development involves three stages.

Step-by-step explanation:

19. The rate of hair growth: Human hair grows at a rate of approximately 1.3 cm per month (option b). This means that on average, human hair grows about 1.3 cm in a month's time.

20. Differences between animal hair and human hair: Animal hair and human hair have several differences, including the cuticle type, the medullary index, and the pattern of pigmentation. Therefore, option d, 'All of these choices,' is the correct answer.

21. The central core of a hair fiber: The central core of a hair fiber is called the medulla (option d).

22. Types of hair on the human body: Forensic scientists distinguish two types of hair on the human body (option a).

23. Stages of hair development: Hair proceeds through three stages as it develops (option a).

Learn more about Hair growth and hair characteristics