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Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting
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The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the womanâs offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction
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Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land
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Which organs are associated with the lymphatic system...
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