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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Mother giraffe and calves feeding. It is mostly the females that raise young, and they may gather in
Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough
Results from sequential study of two cohorts tested at three ages and at three different points in t
Preschool: 3–6 years.
Heart drawing by 6 years old