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acceleration acid adaptive radiation air mass Analysis Application areas atmosphere bacteria best answer blood body boiling point bonds called carbon atoms carbon dioxide cause cell chart chemical reaction Choose the best chromosomes compound Comprehension conclusion contains decreases density describes disease distance Earth earthquake ecosystem effect electric current electromagnetic electrons elements Evaluation example exothermic reaction fertilized following passage following statements force fossil fuels gases GED Practice heat human hydrocarbons hydrogen hydrogen atoms incorrect increases Items km/h ladybugs layer Lesson light liquid living things magnetic main idea mass wasting meristem mesosphere methane Mini-Test molecules motion move nitrogen nucleus object ocean offspring Option organisms oxygen paragraph particles photosynthesis produce protons reacts refer result rock scientists secondary consumers seismic waves sodium sodium bicarbonate solid sound waves speed structures substances sugar sulfur temperature thermosphere tissue trait true Vestigial structures viruses vitamin volcanoes