As scuba divers can safely venture no deeper than 200 feet, the invention of remote vehicles was responsible*^*for finding remarkably well preserved artifacts as well as .
Question 1:
As scuba divers can safely venture no deeper than 200 feet, the invention of remote vehicles was responsible*^*for finding remarkably well preserved artifacts as well as ....... many theories about the cause of disasters.*^*
A.declension
B.declivity
C.demolishing
D.decompose
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