Answer:
Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form organisms.
<span>Fossil fuels, oil , natural gas Renewable energy, wind , geothermal , and solar Nuclear power, <span>Other sources</span></span>
D. Steam enters a cylinder and pushes a piston
