Recent research supports the theory that handedness is the result of which of the following?

Taylor and Madison are 2-year-old identical twins. Taylor's grammar and vocabulary are much more developed than Madison's. Which of the following would most likely explain this difference?

Taylor has a genetic predisposition to accelerated language development. Taylor frequently sings when reading, while Madison prefers to read silently to herself. Taylor is being exposed to more language interaction than is Madison. Madison probably has a cleft palate.

If it were not for the existence of the phi phenomenon, we would not have

a. serial computers. b. lasers. c. television. d. CT scanners. e. peripheral vision.