A rollback does a couple of things: 1  Most importantly, a rollback reverts a question (or answer) back to a previous version in the edit history. The rollback action itself then appears as the most recent item in the edit history. 2  A rollback clears any offensive flags that have been set on a question.
In each of these whorls are one of four organs, including petals, sepals, stamens, and pistils. Petals and sepals do not play an active role in the reproductive process. Stamens and pistils, the flower's male and female reproductive organs, do aid in reproduction.
The four main parts of flowers are sepals, petals, stamens, and carpels. The seeds of flowering plants are enclosed inside an ovary. The ovary is part of a flower's female reproductive structure called a carpel.