Answer:
About 5billion years ago is the correct option.
Explanation:
Hope this will help you :)
Answer:
Groundwater rises, adding water to rivers.
Explanation:
Tributaries combine, adding water to rivers.
Ice sheets melt slowly, adding water to rivers.
Rainfall in an area increases, adding water to rivers.
Answer:
Explanation:
Immune response Evidence points to the fact that this early microbial colonization helps our body to defend itself against disease.
I think that genetic engineering is a good idea because it helps cure deseases that people cant cure, and could possibly cure cancer some day.
Hope my oppinion helped!