Why does the plant cell have a cell wall and a cell membrane?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Plz ! ive been stuck on this forever

Along what geographical feature are most of the oil producing regions located