Organelle that manages or controls all the cell functions in a eukaryotic cell
cell wall
nucleolus
golgi apparatus
nucleus

Nucleus

Explanation:

The DNA of a eukaryotic cell is found in an internal compartment of the cell called the nucleus

preservation because he preserves part of the land and preserves means save

explanation:

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.