Children begin to take part in symbolic play such as pretending to feed a doll imaginary food during Piaget's concrete operational stage of development
Indicate whether the statement is true or false
F
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In experimental research, the variable that the researcher measures because it is thought to be affected by the manipulation of another variable is the
a. extraneous variable. b. dependent variable. c. independent variable. d. controlled variable.
What is the relationship between the motor neuron axons and muscle fibers? a. Each axon innervates only one muscle fiber
b. The more muscle fibers a single axon innervates, the more precise the movements. c. The more axons which innervate a single muscle fiber, the more precise the movements. d. The fewer muscle fibers a single axon innervates, the more precise the movements.
It is always necessary to have at least 25-30 participants in a study
a. True b. False Indicate whether the statement is true or false
Which of the following is not a feature of natural selection that promotes the survival of human infants?
a. their cute faces c. their tendency to orient toward faces b. the sucking reflex d. their stepping reflex