Temperate zones a have the coolest climates on earth b have milder climates than the tropics c are relatively dry d are concentrated in the polar regions

Option (B)

Explanation: The region lying between both the tropics and Arctic and Antarctic circle respectively, are regarded as the temperate zone.

The people living here experiences a somewhat moderate (mild), i.e its not so hot and not so cold. Whereas in case of tropics, the climate is too hot because the equatorial region receives maximum sunlight.

Thus, temperate zones have a relatively milder climate in comparison to the tropics in both the hemisphere.

Hence, the correct answer is option (B).

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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