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In the family tree below, people with the recessive trait of attached earlobes are shaded gray.
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Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.
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The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above
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Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above
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[TRUE OR FALSE]- Different types of organisms have life cycles that include birth, growth, reproduct...
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