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What do i do to comfort my sister who is going through her first period.
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In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?
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Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed
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What do i do to comfort my sister who is going through her first period....
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