The world's population has been growing exponentially. some scientists consider the effects of human population growth a tragedy of the commons. what is the common resource in this example? a. privately owned land b. planet earth c. the sun and moon d. the human population

The correct answer is option B, Planet Earth

Reason-

Here the world common is used to represent the planet earth and all the resources which are present on it. The world population has reached a mark of 7 billion which is putting excessive burden on the existing resources of planet earth be it air, water, land etc, Since the existing and limiting resources are getting exhausted, the planet earth is getting stressed. Since the planet earth is getting stressed all its resources including the human population itself  is at the verge of a tragedy.

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