The correct answer is A: cell
A. Earth
Geocentic, is a theory of Ptolemy. Where the Earth is the center of the solar system.
Cells, tree, digestive system, public transportation system, government systems, school systems, families, dog, forest, pond, prairie, communication systems, towns, insect, solar system, weather systems, bird, correctional system, squirrel, soil, etc.
Answer:
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