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accurate air pressure air thermometer aphids ball balloon beam balance bottle bulb carbon dioxide cast a shadow Celsius centimeters clouds cold air cool direct sunlight dragonflies drinking straw earth turns earthworms ENERGY English system English units flashlight grass green plants grid half happens heat helpful or harmful hold hole ice cube insects interact keep kilogram kinds larvae light source lighted side living things man-made lights mark materials measure distance meter metric system millimeters model moon mosquitoes move object observe oxygen paper piece pill bugs plants and animals plunger pond animals pond community PROBLEM pull record reflect light rubber band ruler sample seeds shadow fall soil Sow bugs spaces spiders spring balance standard unit stick straw Sundials sunlit side sunny Suppose tape tell temperature changes translucent trees vacant lot water animals water plants woods