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.
Those are your skeletal muscles — sometimes called striated muscle because the light and dark parts of the muscle fibers make them look striped
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The main responsibility of the reproductive system is the creation of new life.
