The idea that large fibers in the sensory nerves can prevent impulses from reaching the brain and thus prevent the sensation of pain is part of the _____________ theory of pain

According to cognitive developmental theorists, which of the following is the first step in the building of a child's gender identification?

A) The physical sex of the child B) The gender the child is assigned at birth C) The child's level of postnatal hormones D) The type of behavior the child prefers

In the embryonic stage, what is the term for the outer layer that will form skin, hair, teeth, sense organs, the brain, and the spinal cord?

a) Ectoderm b) Placenta c) Endoderm d) Mesoderm