A genetic mutation results in the inability for a cycad to produce coralloid roots. What types of soils would be least conducive to the survival of this cycad relative to members of the species not affected by this mutation?
A. soils saturated with water
B. soils with lower pH
C. soils with lower mean temperatures
D. drier soils
E. soils with lower nitrogen
Answer: E
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How many biological safety levels are there?
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