what number should replace the question mark? I'll gladly appreciate your response and thank you!! ♥️

Which feature indicates that mars resides in the inner region of the solar system

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?