Answer:
Development that takes place before the age of nine.
Primary sexual characteristics appear at birth and comprise both the external and internal genitalia (e.g., the penis and testes in men and the vagina and ovaries in women).
Usually these painting are made on birch trees because the bark has a much smoother surface compared to bark such as an oak tree.
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He was important because he brought ambulances to the revolutionary war in France to help the wounded soldiers.
