At this time in the earth's history, scientists and others are very concerned about climate change. What is the best explanation for the earth's changing climate?

Rise of population and over-consumption resources are key factors of  climate change.

Explanation:

The fact that climate change is real and is happening at a very fast rate. The impacts of which can be seen in terms of the increase in sea levels.  The rise in global average mean temperatures, an increase in the melting of Greenland and Antarctic glaciers. The exposure of barren land beneath the antarctic continent. Therefore the scientific community s very concerned about the massive depletion of resources and the exposure of the earth's surface to solar radiation.

Cuz i said so. which gives it to b

C) to ensure each new cell has an exact copy of the dna