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Biology Final Review Crossword Puzzle

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Across
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What gasses impede the escape of heat from Earth's surface?
4
What is half of the dry mass on Earth composed of?
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What organelle is included in both plant and animal cells?
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Which variable is the changing factor in an experiment?
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What is the main source of energy for most life on Earth?
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What type of graph is used to show continuing data?
Down
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What do you formulate when you make a prediction about the relationship between variables?
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What type of graph is used to show relationships between groups?
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What type of organism can produce its own food supply?
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What is the last name of the scientist who discovered cells?