A K atom differs from a K+ ion in that the K atom has one... 1) more proton
2) more electron
3) less proton
4) less electron

4)less electron

Explanation:

A K+ ion still has the same nuclus but due to a loss of an electron which is negativly charged the K atom becomes a K+ ion.

region where water drains downhill into a body of water

Explanation:

drainage basin

A watershed, or drainage basin, is a region of land where rain or snow drains downhill into a body of water, such as a river, lake, sea, ocean or wetland.