Answer:
Historians did not learn much about the Harappan civilization from written sources because its writing system has not yet meen figured out. They learned much from building remains, like the drainage system, and where grains were stored.
Explanation:
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All organisms are made up of cells. Cells are the smallest unit of life. Both unicellular and multi cellular organisms are made up of cells.
This is how cells are describes.
:0
Answer: It's the first one
