Upon what does the attraction of gravitation in a body depend?
It depends upon the size and weight of that body.
Do larger bodies attract with more force than smaller ones?
Yes; larger bodies do attract more than smaller ones.
Do heavy bodies attract with more force than light ones?
Yes; heavy bodies do attract more than light ones, although they may be of the same size.
Where are all substances drawn by the attraction of gravitation?
They are all drawn towards the centre of the earth.
Why are substances drawn towards the centre of the earth?
Because the earth is larger than any substance on or near its surface.