Question

vellus hairs __________
are the type of hair found on your head
do not have a distinct medulla
are extremely fine and unpigmented hairs that are shed before birth
are heavy and more deeply pigmented
i dont know yet

Explanation:

Vellus hairs (peach - fuzz) lack a distinct medulla. Head hair is terminal, lanugo (not vellus) is shed before birth, and terminal hairs are heavy/pigmented. So the correct option is the one about no distinct medulla.

Answer:

The correct option is: do not have a distinct medulla