Answer: base substitutions, deletions and insertions
Answer:
Biology: the study of living organisms
Reproduction: process which organisms make offspring
Explanation:
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>