What is the observation of a naturally occurring behavior, without intervention in the situation?

A normal scar resulting from the healing of a wound is called a __________.

a. callus. b. cicatrix. c. crepitus. d. keloid.

A 4-year-old child is shown a row of seven red checkers. He is asked to place a black checker immediately above each red one. By doing so, the child agrees that there are as many red as black checkers. The experimenter then spreads out the black checkers so that the line they form is longer than the one formed by the red checkers. The experimenter asked whether there are more red checkers or more black checkers in order to determine whether the child understands:

A) object permanence B) reversibility C) conservation D) abstract thinking