If a Rh-negative woman and a Rh-positive man have a child, the fetus may haveRh-positive blood inherited from the father. (Approximately half of children born to a Rh-negative mother and a Rh-positive father are Rh-positive.)
If this is the mother's first pregnancy, Rh incompatibility is usually not an issue.
This is due to the fact that the baby's blood does not normally enter the mother's circulatory system during pregnancy.
However, during the birth, the mother's and baby's blood can mix. If this occurs, the Rh protein is recognized as a foreign substance by the mother's body.
It may then begin producing antibodies (proteins that act as defenses against foreign cells) against the Rh protein.
Rh-negative pregnant women may be exposed to the Rh protein, which may cause antibody production in other ways as well.
B) Flu is easily transmitted from person to person.
If there is a very big population density, it means more people are present in a small amount of space. Thus they will come into contact more often and the virus is likelier to spread more rapidly.
She should make observations next. If she doesnt make observations, it would be difficult to form a hypothesis and design an experiment, the result will more likely to be inaccurate too.
