Ethanol is a fuel that can be made from corn. one of the benefits of using a biomass fuel like ethanol is a. it can only be used to power certain types of machines. b. it is a nonrenewable resource. c. it is a renewable resource. d. it releases pollutants when it is harnessed.

Which of the following forest management practices is best for reestablishing areas of forest?

Which of the following organisms are capable of self-fertilization? a. plants b. tigers c. humans

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c. carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit