A mother is trying to teach her little boy to eat his cereal with a spoon. Every time he correctly does so, his mother gives him a small piece of his favorite cookie. This is an example of ________

What does the text describe as "a blanket of fat wrapped around the main part of the neuron that serves the function of keeping the brain's electrical signals on one path and increasing their speed"?

a. synapse b. lipids c. cortex d. myelin

Pneumonia, malaria, and measles are common causes of death for children in ____

a. developing nations b. developed nations c. collective cultures d. individualistic cultures