Which of the following is a North American

biome that has mostly disappeared because of
extensive farming of wheat and corn?



a. chaparral
b. grasslands
c. boreal forest
d. desert
e. more than one of these


B

Biology & Microbiology

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Runners are modified stems that resemble roots and

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Which one of the following ions outside the neuron would make it very difficult for a depolarization to occur?

A) potassium B) sodium C) chloride D) manganese

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In combination with homologous recombination, the CRISPR/Cas system can be used to accomplish

A) gene fusions. B) gene deletion. C) point mutations. D) DNA cloning. E) gene fusions, gene deletions, or point mutations.

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