I believe the answer is <span>c. Factor 1 is a natural factor and Factor 2 is a human induced factor. The amount of heat received by the sun has increased because of the amount of CO2 which human expelled to the atmosphere. Because of this CO2, the heat from the sun couldn't be reflected outside the atmosphere and trapped within the earth.</span>
For factor 1, humans can't control the shape of Earth's orbit. For Factor 2, humans can't cause the amount of heat received by our planet's atmosphere and surface. The question NEVER implies or explicitly states if it were due to humans because of pollution. It just talks about the amount of heat we receive.
Explanation: The water in a river flows uniformly at a constant speed of 2.50m/s between two parallel banks 80.0m apart. You are to deliver a package directly across the river, but you can only swim at 1.5m/s.
