Answer:
1649 years
Explanation:
It took 1649 years for the world population to double, going from . 25 billion people to . 50 billion people
Answer:
When a stem cell divides, each new cell has the potential to either remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell, a red blood cell or a brain cell. There are three characteristics of all stem cells.
Explanation:
1. Deforestation = the burning of fossil fuels to make energy
2. Combustio = the logging of trees, which removes producers from the carbon cycle
3. Circulation= the process which brings up nutrients from deep ocean
4. Weathering= the wearing down of rocks over time.
5. Calcium carbonate= the primary component to mollusk shells and coral skeletons
I hope this helped.
