Asexual reproduction - A type of reproduction that doesn't use sex cells., Egg - A sex cell produced by a female organism that is needed for reproduction., Sperm - A sex cell produced by a male organism that is needed for reproduction., Fertilization - The joining of an egg and sperm that starts development., Pregnancy - The time when a baby develops in the womb before being born., Embryo - The very early stage of development during pregnancy., Differentiation - The process in which a cell changes into a different type of cell., Stem Cell - A cell in a multicellular organism that can turn into different types of cells.I, Puberty - The period in human development when adolescents become able to reproduce., Adulthood  - The period in human development when a person hits full physical and mental maturity.,

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