Rills, gullies, streams, rivers and tributaries are all caused by

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Water erosion moves water downhill and during this process, different landforms are formed. Some of them are rills, gullies, streams, rivers, tributaries, waterfalls, floodplains, meander, lakes, etc.

Water erosion

Explanation:

Because they all deal with some form of water

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.