Answer:
The force that gravity exerts upon an object.
The correct answer for this question would be C) At seafloor spreading centers or the third option.
It’s funny because the concept of sustainability is thought to come from field of forestry. Around the year 1700, Carl von Carlowitz described the concept of sustainable forestry.
First, you need to do the multiplacation that's inside the perenthises.
Second, you will need to divide the two answers which will give you that first box.