Throughout human history, major migrations have been spurred by sharp decreases in the availability of food caused by hazards or changes in climate For example, the Choose
was the result of a drought and wind-driven erosion. The Choose...
on the
other hand, was caused by a fungal disease that infected an important crop.

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.

Probably a behavioral adaptation