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air sacs automatically baby bathroom bladder blood vessels blue eyes blue gene body needs bone cells brain stem breathe capillaries carrying messages cerebellum cerebrum chromosomes cochlea dead skin dermis digested food dreams ear canal eardrum embryo epidermis esophagus fallopian tubes father feel fist follicles food and oxygen food tube germs goose bumps grow hear heart beats help break identical twin inside your body keep larynx light liquid look lungs memory says mother mouth muscles need food nerve endings nervous system ninth month nose ovary place called plasma platelets protects pulmonary artery pump pupil push red blood cells retina right atrium right ventricle rubber band scab short bones skin cells sleep small intestine sound waves reach sperm cell spinal cord squeeze stirrup stomach stored stretch sweat glands things thump trip tube called urine uterus valve left ventricle vibrate vocal cords waste White blood cells windpipe x-chromosome