Which theory of sleep is based on the premise that sleep evolved to keep humans out of harm's way?

Demonstrating the reliability of a measure is most important to establishing ____________ validity?

A. Construct B. External C. Statistical D. Internal

He lives with his mother. His mother is prone to migraines and long

periods of unexplained illnesses. When ill, she is incapacitated and cannot leave her room for hours, sometimes days. She never calls for help but just leaves Leroy to take care of himself. When Leroy comes in and tries to talk to his mother, she often ignores him or pretends to be asleea. Physical abuse b. Neglect c. Emotional abuse d. Sexual abuse e. Although Leroy's mother is not very involved in his life, her behavior is not sufficiently severe to be considered abusive or neglectful.