It was necessary, for life to exist on Earth, that organisms’ possess the ability to pass, store, and pass on molecular information to the next generation. The two molecules capable of these two processes are RNA and DNA. What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases

The human genome consist of about chemical letters

What is the correct name for the animal pictured on the right? puma cougar panther mountain lion catamount