The climates make up the largest climatic zone on earth.
a. continental
b. polar
c. dry
d. tropical

The C. climates make up the largest climatic zone on Earth.

C. Dry

Explanation:

Climate zones are areas with distinct climates, they can be classified using different climatic parametres such as temperature, moisture, wind and sun, and both daily and seasonal patterns. Acording to Köppen climate classification the climates are divided into five main groups: A (tropical), B (dry), C (temperate), D (continental), and E (polar).

Arid and semiarid climates cover a quarter of Earth's land surface, this makes it the largest climate zone.

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brave new world, aldous huxley (1932)