The question that could be investigated through scientific research is B. Does a newly synthesized chemical reduce bacteria? The answer is B. Because the other questions aren’t science questions. They are bias.
If the offspring is different from the parents, then it would be sexual reproduction.
Trichomonas vaginalis can be distinguished from other parasitic protozoa because it is responsible for urethritis and vaginitis in humans. It has an undulating membrane, it can infect the vagina in women, and it is often transmitted by sexual contact, so it can be considered an STD. Given that it can cause many complications in a woman's reproductive system, it should be treated immediately.