For any point on earth's surface, its height above sea level is called its

The height above sea level of a point on Earth's surface is its elevation.

Explanation:

The difference in elevation between the highest and lowest parts of an area is its relief. Landform is feature of topograpy, such as a hill or valley, formed by the processes that shape Earth's surface.

the supermassive black hole is in the middle of the galaxy.

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.