Theory states that the extraterrestrial forces that have influenced climate rhythms over the last two million years have occurred primarily because of cyclical changes in earth’s orbit around the sun. identify which statement is true. a) every 41,000 years, the tilt of earth’s spin axis oscillates between 17.5° and 19.5°. b) every 41,000 years, the tilt of earth’s spin axis oscillates between 19.5° and 21.5°. c) every 41,000 years, the tilt of earth’s spin axis oscillates between 21.5° and 24.5°. d) every 41,000 years, the tilt of earth’s spin axis oscillates exactly 21.5°.