Which correctly describes a difference between the male and female reproductive systems?

The male and female reproductive systems are there to produce gametes, and aid in fertilization and reproduction. There are different reproductive organs in males and females, which are characteristic of each other. For example, the presence of a penis, and scrotum. These are designed to produce and deliver the sperm, as male gametes.
The female reproductive system is composed of ovaries and uterus. They are designed to produce the egg, the female gametes, and develop and nurture the fetus, inside the women's body.

Ciliophora

Explanation:

Ciliophora phylum of kingdom Protista is characterized by the presence of short hair like projection called cilia all over the body surface of organisms. Cilia serve in locomotion of these organisms. These organisms are eukaryotes and have two nuclei. They are found in both freshwater and marine water habitats. One of the examples is Paramecium.