Early in development, the nervous system begins as a ____.
a. tube surrounding a fluid-filled cavity
b. spherical structure in the center of the embryo
c. diffuse system of cells scattered throughout the body
d. single layer of cells covering the heart and other internal organs
Question 2
Looking at a picture of people showing emotional expressions causes the greatest activity in the ____.
a. frontal lobe
b. hippocampus
c. fornix
d. amygdala
