Answer:
The answer to the question: Tropical and polar climate zones are very distinct, this is because: the sun´s rays are more concentrated towards the equator than the poles and second, because the ozone layer tends to thin out towards the poles, a system that allows heat to exit Earth to prevent it from overheating the planet.
Explanation:
The first reason why the Tropics tend to be different in their climate from the poles has to do with the way the sun hits different parts of Earth. In the case of the equator, the sun´s rays hit this zone almost directly, which ensures more warmth. But the poles receive these rays more obliquely. But another reason comes from the ozone layers which protect the planet from the sun. In the equator region, which is were the tropic climate is, the layers are thicker and thus trap heat from the sun better, whereas in the poles, these layers thin out. It is almost like the Earth´s own refrigeration system to prevent from overheating.