Question 1
During which stage of development do children first demonstrate a decline in egocentrism and a mastery of conservation?
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concrete operational stage◦
sensorimotor stage◦
preoperational stage◦
formal operational stageQuestion 2
During which stage of development does the cell mass that develops from the fertilized egg implant itself in the uterine wall?
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embryonic stage◦
fetal stage◦
germinal stage◦
fertilization stage