Eliska is 9 months old. one of her favorite games is peek-a-boo, and recently she has begun to pry at her mother's fingers when mother covers her face. eliska has developed the understanding that mother is still behind her hands even when eliska can't see her.
a) sensory operations
b) concrete operations
c) conservation
d) object permanence

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.