The mouth because the digestive process begins when your teeth break down the food and then your saliva continues to break the food down and assist with swallowing and moving it along the rest of the digestive tract
To get a better look at the fetus- They can do a more in depth examination and see if the child has any malformations or if sex wasn't determined before the sex of the fetus.
The answer is C. Positive , negative , cognitive
