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

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.