First is the brain, spinal cord, and heart begin to develop. Then A blood vessel forms which will later develop into the heart and circulatory system.
The answer to your question is D.
I'm thinking it would be lack of knowledge of disease. If a parent doesn't know about childhood diseases then they won't know what to look for. Example, my newborn nephew had a cough and congestion, they took him to the ER last night and found out he has DSV and that he most likely got it from his older sisters who also have a cough.
The answer is false because then you Would be dehydrated <span />
A diet with a lot of iron it a lot of protein from dairy products will help.
