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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).
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Explanation:
Well one reason we should not do space because the radiation exposure is 10 times more the it is on the land.. there is 80% of ocean to explore and we can not go more then about 35,000 feet into the ocean which is not to the bottom of the ocean.. i do not know if those would help you but there are some info...
