Answer:
DNA, cell membrane, cytoplasm, and ribosomes.
<em>Because sometimes building these facilities is expensive and they usually have to be built in remote areas and burning fossil fuels has also been cheaper than using renewable energy in the past. Another issue is that the form of energy isn't available all the time.</em>
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Answer:
planetesimal is (astronomy) any of many small, solid astronomical objects, that orbit a star and form protoplanets through mutual gravitational attraction while planet is (astronomy) a body which orbits the sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid)
