Which mode of subsistence includes the search for edible things? foraging intensive agriculture pastoralism horticulture?

The following mode of subsistence includes the search for edible things: FORAGING.

Foragers use a variety of hunting and gathering techniques to procure edible things.

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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.