The main difference between human brains and the brains of their mammalian relatives is that human brains tend to be bigger and

Poverty is the single most troubling social problem adolescents living in the United States face

Indicate whether the statement is true or false.

There are two kinds of receptors found in the retina. They are ________

a. rods and ganglion cells b. bipolar cells and cones c. rods and cones d. ganglion and bipolar cells