Put these layers of the Earth in order, starting at the outermost layer and going inward.
1Liquid core
2Crust
3Mantle
4Solid core

Pls help

1 crust

2 solid core

3 liquid core

4 mantle

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.