Environmental Science
A term biotype means

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

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Circulation of heat by the atmosphere and oceans
The insulating properties of snow
Concentration of earth's magnetic field lines at the poles
Release of latent heat to the atmosphere when polar ice melts
Conduction of heat through the interior of the earth

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