Human cells as well as plant and animal cells
Answer:
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The opinions and prejudice of an author in writing.
I believe that those two elements greatly affect bias in history because we can never be 100% sure of everything that (may have) happened in history (especially farther in the past), so opinion can affect a historian's writings. Also, everyone is prone to some sort of prejudice, so this can also affect history.
The physical process that is responsible of the creation of these actions is the movement of earths tectonic plates. When tectonic plates push against each other they both could go up and make a little hill with a opening in it!