B. Placenta (works with the umbilical cord to provide nutrients to the developing human)!
The answer is Mentruation
D is preferable.
Explanation:
The behavior response requires communication between cells and an organ system.
This is only my opinion, but I think it is better to consume conventional medicines. Natural medicines don't guarantee a cure. Conventional medicines have been analyzed and researched to be produced with the right antibiotics for a given sickness. Bacteria in your body is continuously evolving to become resistant to antibiotics in your body. At some point, the medicine you put in your body will have no effect. By consuming natural medicines, once the bacteria in your body have become adapted to it, since there are a limited number of natural medicines, you can no longer take them. By consuming conventional medicines, scientists can continue to improvise and produce newer medicines that can cure us before the bacteria become resistant to them.
