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Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them […]

You and your classmates differ widely in your familiarity with this topic. 1) You may be unmarried and have not thought much about it yet. 2) […]

Are Bacteria prokaryotic or eukaryotic? Describe the three common shapes of bacteria. Are Bacteria heterotrophic or autotrophic? Do Bacteria cells have a cell wall? How do […]

Data show that although water fowl are breeding in aparticular estuary, the percentage of young that survive isdecreasing. Two years ago, engineers dug a deep channel […]

Is “evolution” a proven fact or a theory? What other ideas compete with evolution to explain changes in populations? What are the differences between these competing […]