Select the correct answer. Which of the following is one of the most significant reasons cogeneration is not widely used?
OA.
It is less efficient than conventional methods of producing energy.
O B.
Biofuels are new, and people are reluctant to use them.
O C.
Thermal energy is not useful like electricity is.
OD.
It requires cost-prohibitive equipment upgrades.
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What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls