Explain what differentiates the earth’s crust and lithosphere.

The crust of the Earth is differentiated from the lithosphere as the crust signifies towards a compositional layer, while the lithosphere is a mechanical layer, that is, the solid layer close to the surface of the Earth. The crust primarily comprises alumino-silicate minerals, while the lithosphere comprises some of the solid parts of the upper mantle, that is, majorly ferromagnesium silicates.

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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.