Eyebrow hairs are always shorter than hairs on your head because ________.
A. eyebrow follicles are only active for a few months
B. hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length
C. they grow much slower
D. the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle
Answer:A
Eyebrow hairs are always shorter than hairs on your head because ________.
A. eyebrow follicles are only active for a few months B. hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length C. they grow much slower D. the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle