What does the strength of the force of gravity depend upon?

Gravity depends on mass. The mass is the weight of an object, how much of weight it contains. The more mass the more gravity is applied an vice-versa.

The strenght of the gravitational force depends on distance. If something is far, it'll be less influenced by the force and viceversa.

Hope it helped,

BioTeacher101

the correct answer is - ability to find a mate

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs