Environmental Science
The aurora is produced by:

Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields
Burning oxygen caused by the intense sunlight at high altitude
Fast-moving charged particles colliding with air molecules

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Environmental Science
A term biotype means

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

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