Is reproduction necessary for maintenance of our organism?

yes, it is necessary.

Explanation: if an organism were to stop reproducing, the entire species would become extinct. Reproducing maintains an organism and the ecosystem it lives in.

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )

answer; hydrologic cycle;