Please help is it A, b,c or d

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Describe the function of the endomembrane system? what organelles are involved?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.