Environmental Science
At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

23,000 and 43,000 feet
6,500 and 23,000 feet
200 and 6,500 feet
Above 43,000 feet

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Environmental Science
A term biotype means

all individuals having same phenotype
all individuals with different genotype
all individuals having same genotype
all individual with different phenotype

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Environmental Science
Mycorrhiza represents

Parasitic association between a fungus and an alga
Parasitic association between a fungus and roots of plants
Symbiotic association between a fungus and roots of higher plants
Symbiotic association between a fungus and liverworts

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