One reason alternative energy sources are needed is because A. the energy needs of the world are decreasing
B. there is no limit to the supply of fossil fuels
C. the population of the world is decreasing
D. the supply of fossil fuel is diminishing

Which term refers to the total dollar value of the goods and services produced in a country in a year?

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a.the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

What field of science did harry hess study?