Which did you include in your answer? Check all that apply. In 2003, astronomers discovered Eris.
The discovery of Eris caused astronomers to talk about the defining characteristics of a planet.
Because Pluto has not cleared its orbit, it is not considered to be a planet.
Pluto, Eris, and other objects like them are now classified as dwarf planets.

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.