Don't pollute the Earth.
Don't need gas.
Answer:
A. Revise the hypothesis based on the results and use it to design another experiment.
All above I think I don't know
Water enters the soil in a process called infiltration, and then moves downward through the soil in a process called percolation.
Answer:
The central nervous system is made up of the brain and spinal cord.
The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
