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Start 4th Grade Life Science 5th Grade Life Science Grade Earth Science Grade Earth Science 5th Grade Physical Science 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 4th 5th 100 Producer Which type of organism is always the first step in a food chain? Click here for answer back 200 They make food by photosynthesis. Why are green plants and algae called ”producers”? Click here for answer back 300 The sun What is the main source of energy entering most food webs? Click here for answer back 400 Water ecosystems In which type of ecosystem are protists often the main producers? Click here for answer back 100 the bladder What organ stores urine? Click here for answer back 200 colon Waste leaves the body through the- Click here for answer back 300 Oxygen When blood leaves the lungs, what is it carrying? Click here for answer back 400 Carbon dioxide When blood is pumped by the heart to the lungs, what is it carrying? Click here for answer back 100 They break down into smaller pieces. What happens to rocks when they are frozen and thawed again and again? Click here for answer back 200 Moving water. What erodes rocks and land the most? Click here for answer back 300 moving large amounts of dirt. A glacier changes landscape mostly by− Click here for answer back 400 a glacier. Grooves cut into bedrock are most likely a result of - Click here for answer back 100 cooling it Which action would turn water vapor into a liquid? Click here for answer back 200 Through tubes called xylem How do vascular plants transport water and nutrients? Click here for answer back 300 It turns into a solid. What happens to liquid water if it is cooled below its freezing point? Click here for answer back 400 Condensation to precipitation In the water cycle, solar energy causes which change? Click here for answer back 100 A graduated cylinder What do scientists use to measure the volume of an irregular object? Click here for answer back 200 The number of protons, which is the atomic number. What characteristic was used to arrange the elements in the Periodic Table of the Elements? Click here for answer back 300 float. If an object’s density is less than one gram per milliliter, then when it is dropped in water it will - Click here for answer back 400 Physical change Copper that has been hammered into a sheet is an example of what kind of change? Click here for answer back