Write the name for the mitotic stage that matches each phrase: nuclear membrane and nucleolus disappear: spindle is formed: separation of sister chromatids: daughter cells are usually formed: rod-shaped chromosomes are first visible: chromosomes line up on equatorial plane: new nuclei are formed: daughter chromosomes migrate to opposite poles of the cell:

1. Nuclear membrane and nucleolus disappear: Prometaphase.

2. Spindle is formed: Prophase

3. Separation of sister chromatids: Anaphase

4. Daughter cells are usually formed: Telophase

5. Rod-shaped chromosomes are first visible: Prophase (first visible) Metaphase (completely visible).

6. Chromosomes line up on equatorial plane: Metaphase

7. New nuclei are formed: Telophase

8. Daughter chromosomes migrate to opposite poles of the cell: Anaphase

Explanation:

Mitosis process occurs in the following order:

1. Prophase: Prophase is the start of cellular division. In this step, chromatin is condensed into chromosomes and spindle is formed.

2. Prometaphase: In this step, the nuclear membrane breaks down and sister chromatids start to migrate to the equator of the cell.  

3. Metaphase: Here, chromatids are aligned into the cell's equator and now chromosomes has the rod-shape.

4. Anaphase: Sister chromatids separate, and they migrate toward the daughter cells' poles.

5. Telophase: Here, new nuclear membranes are formed and daughter cells can be seen. Finally, they separate into two new cells.

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.