Answer:
cells, organs, tissues, organ system
sorry if im wrong i tried
Explanation:
Answer:
To transport signals to the rest of the body and to keep the body upright.
Explanation:
To protect the nerves and keep the body upright. This is because if your spine is broken, then you become paralysed therefore it's an extremely important aspect for the body.
That would be a, chemical to mechanical
Answer:
yes all day of the year have the same amount of the light