Between a parent and child
Answer: an economic phenomenon where two parties each hold an item the other wants, so they exchange these items directly without any monetary medium!!
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It would be <span>B.early agricultural innovations attracted researchers to the area and led to new achievements in biology and genetics. The innovations and breakthrough in early innovations in agriculture magnets a lot of researchers to further develop the progress and thus becoming the leader of field of agriculture and develops further than anyone else.</span>
a) the fertile soil led to food surpluses, which supported a larger group of people
