What is the coefficient of oxygen gas after balancing the following equation?

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse