Answer:
According to the current fossil record, scientists believe that the life on earth began about 3.5 billion years ago.
Answer:
red if it has oxygen, but blue when it doesnt
Explanation:
1. encating laws or voluentary agreements
2. working to keep enough attractive affordable houses
3.assuring that development is spread out fairly
4. make quality trasportation
The geological conditions.
Answer:
Unstable membrane potentials
Explanation:
