Why are trees essential to planet earth? Write 4-5 sentences

TREES SUSTAIN LIFE ON EARTH

Trees are a vital part of our planet's ecosystem. We all rely on trees and their products: oxygen, fruits, wood, water, medicines and soil nutrients to name a few. They not only give life, but they also improve livelihoods

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.