A researcher who wants to know whether drinking caffeine causes increased energy would be most likely to conduct what type of study?

People with severe, uncontrollable epilepsy, who have frequent grand mal seizures, have been helped by an operation that _____

a) severs the communication between hemispheres. b) removes excitatory neurons. c) severs the substantia nigra and basal ganglia. d) removes most of the right hemisphere.

As little as 30 minutes of total exercise per day, even if it occurs in short 10- to 20-minute sessions, can improve mood and energy and relieve stress

Indicate whether this statement is true or false.