This is for biology
q: a man weighing 980 n on earth weighs only 163 n on the moon. his mass on the moon is kg

(fill in the blank)

the answer is b, encourage free trade

the telephone is the answer

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.