What did Aristotle think regarding fossil shells? A. that geologic time could be determine by rock strata
B. that geologic time cold be calculated by shell deposits
C. inferred that fossils were once part of living animals

no the answer is c only objects touching the earth's surface can be acted upon by an outside force

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.