Evolution is a gradual change that develops a species into a:

The correct option is D All of the above.
Theories on the origin of life explains how life originated from chemical evolution, i.e., from simple organic molecules that have gradually joined together into complex organic molecules like DNA and RNA. These complex molecules on self - replication, have progressively led to the formation of different life forms that have developed into better organisms seen today. Thus, evolution as a whole is a gradual process that changes a simpler molecule into a different, complicated and mostly, a better one.