Why is the demand for labor called a dervied demand

David, an aspiring baseball player, was struck on the left side of his face with a fastball pitch. he was not wearing a safety helmet. his zygomatic arch was crushed, as well as parts of the temporal bone. following the accident and reconstructive surgery, he noted that his left lower eyelid was still drooping and the corner of his mouth sagged. what nerve damage did he sustain?

Victoria enjoys laughing with her friends as they walk around the track after school which best describes her heart rate during this activity

Albert badura and b.f skinner agree that cognitive factors play no role in personality development. true or false