I think the answer is B because it use mechanical power and convert it into electricity
C. Chromosomes because they are need to have the cell funtion.
The growth rate of Earth is decreasing, as the birth rate is the main source. The death rate is mostly abortion which tyes in with birth rate. Much types of emigration have been seen. Mostly Asians, because most asian countries only want the boys and not the girls. Trump is thinking of making a wall to stop mexican immigration.
Earthquakes only happen in certain areas of the world
