Answer:
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The astronomical event that represents the great serpent mound is Halley's Comet.
Plant cells are differentiated from the cells of other organisms by their cell walls, chloroplasts, and central vacuole. Chloroplasts are organelles that are crucial for plant cell function. These are the structures that carry out photosynthesis, using the energy from the sun to produce glucose
The region is usually called the Indian Subcontinent.