Medical science provides many ways to diagnose the cause of infertility and to treat it. which procedure involves “washing” to separate healthy sperm from the unhealthy ones, and then placing this concentration of healthy sperm into the uterus around the time of ovulation?

The correct answer is intrauterine insemination.

Explanation:

In the procedure of intrauterine insemination, the female is administered with ovulation-stimulating hormone or medication, and post that screening is done to find out that when the maturity of the eggs takes place. After ovulation, a sample of semen is washed to differentiate the sperms from the seminal fluid, that is, discarding the unhealthy sperms. After that, a catheter is utilized to mediate the sperm or to present the sperm directly into the uterus. The mentioned procedure enhances the occurrence of conception.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

i think the answer is b.

hope it