Plz !
which of these is not a challenge an organism encounters? ?

a. regnerating
b. saying healthy
c. reproducing
d. getting energy

b hope this

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.