Upside down - When a baby is ready to be born, it lies in this position, Oviduct - The place where the eggs and the sperm fuse, Embryo - The ball of cells that grow into a baby is called a..., DNA - Chromosomes are made up of long lengths of ..., Placenta - Attached to the uterus wall that supplies the baby with nutrients and oxygen, Umbilical cord - Carries food and waste between the mother and baby, Amniotic fluid - Protects the baby, acts as a shock absorber, Gestation - The time an embryo remains within the mother's body, Smoking - A mother should avoid this as it can be harmful to a developing baby, Eye colour - An example of an inherited characteristic, Scars - An example of an environmental characteristic, Half - How much genetic material you get from each parent, Tail - Helps the sperm cell reach the egg quickly, Puberty - The time when a boy or a girl develops into an adult, their reproductive systems need to change and become fully working, Testes - Sperm is produced here, Ovary - The female reproductive organ,

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