What is the difference between ponds and lakes versus rivers and oceans? shallow water versus deep water
many living things versus few living things
under-water sources versus above-water sources
standing water versus moving water
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D. i believe.

Explanation:

A makes sense but there are really deep lakes too, so that is not correct

b doesn't make sense because,  they are both habitats , so this is not correct

C makes sense but there can also be above water resources at ponds and lakes too

D makes sense because mostly, ponds/lakes don't have currents, while oceans do

Have a good night!!

-Red