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.
Answer:
you could use styrofoam for the planets and the sun and paint them, for rings around planets you could use pipe cleaners and use a styrofoam bottom and have sticks to secure the planets
Explanation:
If you choose to bottle feed your baby, use an Iron fortified baby formula.