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Why are scientists concerned about the depletion of the ozone levels in the stratosphere?
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The cluster of developing cells from conception until birth is called an
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During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are
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2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.
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Describe two ways in which human activities have affected the world’s
(a)-deserts
(b)-...
(a)-deserts
(b)-...
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