If there are people in the family that are alcoholics or have had alcohol issues in the past.
Responsible friends would never engage you in risky behaviours, especially in sexual ones. Responsible friends are most likely not to do this kind of things, but you also have to be responsible.
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Answer: The nervous system
Explanation:
The first part of the embryo to develop is the neural tube, which will become the spinal cord and brain. As the nervous system starts to develop, the tiny heart starts to pump blood, and other parts of the body—such as the digestive tract and backbone—begin to emerge.
