I think it would be phase 1 (sorry if I’m wrong)
Our ancestors only eat what they needed. They did not splurge, or take their girl friends out on dinner dates for fries and greasy meals. They hunted and they dined in the driest and roughest of places. The CroMagnons, as beautful and naked as they were, because a symbol of humanity towards the future.
Answer:
I don't understand your question but here's an answer
Explanation:
The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would be without an atmosphere. The greenhouse effect is one of the things that makes Earth a comfortable place to live.
I think two are stem cell research and cloning