Evolution would be the answer you may be looking for.
Answer:
Darwin's greatest contribution to science is that he completed the Copernican Revolution by drawing out for biology the notion of nature as a system of matter in motion governed by natural laws. With Darwin's discovery of natural selection, the origin and adaptations of organisms were brought into the realm of science
Population because if they don't get water every day they will start to die in their population will start to fade out and then they'll become extinct
Answer:
C= Estuary
E=Tributaries
D=Susquehanna river
A= Divide
G=new york
B= Rivers
F=York River
Note:
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<em>All credit to </em>
<em>kiniwih426, who created this answer and explanation</em>