The purpose of a cell wall within a plant cell is to provide the cells with protection and structure. It allows also allows the plant to grow tall and strong, cell walls act like a shield and a spine for a plant.
The sun moving is what causes the different seasons on earth
The correct answer in this question is the third option which is how well the existing scientific data are explained by the new theory. Science relies on results that follow the scientific method through observation and experimentation. Mathematical and computational tools are also used as evidences.
I would choose the one who is the most wisest, most responsible, and respected. Also someone you COMPLETELY trust.