How will melting permafrost in polar regions lead to a positive feedback loop that will continue to warm the climate, which will allow for more permafrost to melt

Will give brainliest asaapppppppppppp plz im in a major hurry to finish which of these pairs of objects exerts the greatest gravitational force on each other? object 1 and object 3 object 4 and object 3 object 1 and object 4 object 4 and object 2