what planet is known as the red planet?, venus, mars, what gas do plants absorb during photosynthesis, oxygen, carbon dioxide, what part of the human body pumps blood throughout the body?, heart, brain, what is the boiling point of water in celsius?, 100, 90, what pulls object toward the earth?, magnetism, gravity, what is the largest organ in the human body?, skin, heart, what do you call animals that can eat only plants?, omnivores, herbivores, what is the largest planet in the solar system?, saturn, jupiter, what part of the plant makes food?, leaf, stem, what is the basic unit of life?, atom, cell, what is the center of the solar system?, moon, sun, what mineral is used to make pencils?, iron, graphite, what organs help humans breathe?, lungs, kidney, what do you call the change from liquid to gas?, evaporation, freezing, what is the hardest natural substance on earth?, gold, diamond

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