Brain, Spinal cord, Nerves, Memory, Thinking, Coordination, a reflex action, immediately, injuries, damage, protect, Keep proper posture, exercise regularly, Urinate, Sweat, Breathe, Kidneys, Ureters, to connect kidneys and bladder, Bladder, store urine, Urethra, urine leaves from the body, Salt, diseases, addictive, Tar, cause yellowish nails, Yellowish, Nicotine, cause addiction, Carbon monoxide, speed up ageing, Ageing, Wrinkles, Cancers, Tobacco, Cigarette, cough medicine, ecstasy, Cannabis, Ketamine, commit crime, treatment, Earth, Complete, =finish, Different, =various, Divided, time zones, temperature, angle, overhead, more focused, slanted, less focused, revolves, Hemisphere, Northern / Southern, Equator, seasons, Spring/Summer/Autumn/Winter, craters, rough, moon phases, solar eclipse, solar filter, lunar eclipse, occur, =happen

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