Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

The earth is closer to the sun in summer
All of these
The sun is higher in the sky and we receive more direct solar radiation
Only (b) and (c) are correct
The days are longer

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Environmental Science
A term biotype means

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

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