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Humans and the Environment
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alpha particles amino acids ammonia amount Analysis animals antibiotics Application atom bacteria biologists birds blood body bone carbon dioxide cause chemical reaction Choice cholesterol cold fusion color color-blind compost pile compound Comprehension contains cowbird crust dandelions decreases diagram disease dissolved Earth eggs electricity electrons elements energy Evaluation exothermic reaction flowers following information following statements force friction fulcrum gases gene genetically engineered graph grow heart attack human hydrogen bomb incorrect increases indicates infection Items layer lever light liquid living things mantle metal molecules move muscles myoglobin neutrons nucleus omega-3 Optional Writing Activity organisms Orthoptera oxygen p-type semiconductor passage Pb Pb Pb percent petrified materials plants polar bears potassium nitrate potato produced proteins protostar seeds smell sodium sodium chlorate solar cells solubility solution sparrows spring star substance sugar surface temperature tide tomato trace fossils true vacuoles waves whooping cranes