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The use of stem cells in research and treatment remains controversial because stem cells come from
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This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic
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The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen
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The diagram shows a chicken embryo and a human embryo
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