What are climate zones

Climate classification systems are ways of classifying the world's climates. A climate classification may correlate closely with a biome category, as climate is a major influence on biological life in a region. The most popular classification scheme is probably the Köppen climate classification scheme.

Eg: Tropical zone from 0°–23.5°(between the tropics) ...

     Subtropics from 23.5°–40° ...

      Temperate zone from 40°–60° ...

      Cold zone from 60°–90°

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the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.