In order to prevent the researcher's expectations from influencing study participants, a(an) _____ design is used

Based on what you learned from the text, which of the following best describes a child, in Piagetian terms, who is centered?

"They often focus on one noticeable aspect of a cognitive problem to the exclusion of other important aspects." || "They have difficulty understanding that objects can be simultaneously part of more than one "class" or "group." || "They often attribute human thoughts and feelings to inanimate objects and forces." || "They lack the ability to distinguish between their own perspective and another person's perspective." || || ||

A person would not be able to walk nor a musician move his or her fingers to play an instrument without the neurotransmitter

a. curare. b. serotonin. c. acetylcholine. d. histamine.