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

D. eyebrow follicles are only active for a few months

Explanation:

Actually, eyebrow hair follicles are just active for couple of months that's why these become shorter than head hairs because head hair follicles remain in anagen phase means active growth phase. When blood flows through scalp it will feeds the hair follicles and cells divide continuously and at the result push hair farther and farther our from the skin.

b brown mice / white sand dunes