While in health class, Marissa writes that the main function of the male reproductive system is to produce and transport ova for reproduction. Which explains Marissa's mistake?
The main function of the male reproductive system is to develop secondary sex characteristics.
The male reproductive system only produces ova and does not transport them.
The male reproductive system produces and transports sperm, not ova.
The main function of the male reproductive system is to develop hormones.

With respect to Marissa's writing that the main function of the male reproductive system is to produce and transport ova for reproduction, the error is that the male reproductive system produces and transports sperm, not ova.

Explanation:

The male reproductive system consists of the testicles and attached structures —such as the epididymis, vas deferens, seminal vesicles— as well as the prostate and penis, which are responsible for producing and transporting the male reproductive cells, the sperm.

Marissa's mistake was to say that the male reproductive system produced and transported ova - eggs - which are produced in the ovaries and transported by the female reproductive system.