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air sacs animals arteries baby's bacteria begins bend bile bladder blood cells blood vessels body needs body temperature body's bones brain breathe called carbon dioxide carry cerebrum chew chromosomes clean cochlea cold color contract dentist digestion doctor duckling egg cell epidermis eyebrows eyes fastened feel fertilized egg cell finger follicle genes germs girls glands hair grows hands heart heartbeat hormones inches long infection inside juices keep kidneys kind layer liquid liver lower lungs lymph melanin middle ear mother mouth move nerve cells nerve ends nose ovaries oxygen pain pancreas perspiration plaque protect protein pump push rib cage scalp shape skin skull small intestine smell sound sperm cell spinal cord spine stomach taste buds teeth things tiny tissue tongue tooth tube uterus vagina ventricle vertebrae vibrate vocal cords waste white blood cells white cells windpipe wrist