A frog's eyes are highly sensitive to small, dark, moving spots. Since the frog's eyes are attuned to this specific stimuli, the frog's eyes act as

For children in the single-word stage of language development, single words __________

a. often lack prosody b. are often over-expanded c. are different from the ones that adults use d. can convey complex ideas

To increase psychological efficiency, a business manager would be well-advised to apply the concepts of

a. Theory X leadership. b. task analysis and time-and-motion studies. c. Theory Y leadership. d. scientific management.