2 floors because they are double the work.
When a light is on, it is part of a "closed" circuit.
Answer:
Actually, many single-celled organisms have a structure that facilitates mobility within the cell's environment. These often take the form of flagella, thin structures that emanate from the cell wall and push into the outer environment
Explanation:
Wastes
Fuel
Smoke
Gas
Toxic chemicals
The wave length of light. This determinds the color/type of light.
