A procedure in which the order that participants receive different treatments or participate in different groups is balanced or offset in an experiment is called ______.
A. counterbalancing
B. median positioning
C. carryover effects
D. internal validity
Answer: A
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Which of the following is a type of glia that helps new neurons reach their final destination in the brain?
A. Schwann cells B. astrocytes C. microglia D. radial glia
Identical twins who have the same genetic propensity for disease and who die at the same age always have the same compression of morbidity, even when they have different lifestyles
Indicate whether this statement is true or false.
The "rule" that says humans should drink eight cups of plain water per day is
A. a good one, because that is about the right amount of fluids everybody needs. B. not so good, because we need about twice that much fluid for good health and skin. C. unnecessary, because we take in all the fluids we need from our foods. D. unnecessary, because we take in about half the fluid we need from our foods.
The World Health Organization recommends breastfeeding until age
A) 6 months. B) 12 months. C) 18 months. D) 2 years.