I believe they use enzymes
All energy sources have some impact on our environment. Fossil fuels—coal, oil, and natural gas—do substantially more harm than renewable energy sources by most measures, including air and water pollution, damage to public health, wildlife and habitat loss, water use, land use, and global warming emissions.
That answer would be A. nucleus
•move
•maintain homeostasis
•require and use energy
•respond to stimuli
•reproduce
•grow and develop
•display organization
•made up of one or more cells
