Evolution does not cause something to go from “lower” to a “higher” stage of development. In many cases, organisms can evolve without any major improvements. Some examples of this are fungi, sharks, crayfish and mosses. These organisms have all remained virtually the same over a great period of time.
The Hottest Planet in Our Solar System
Even though Mercury is the closest planet to the sun, Venus is really the hottest. The surface temperature of Venus is so hot it can melt lead. The temperature at the surface is 740 K (467 degrees Celsius or 872 degrees Fahrenheit).