is defined as a brain imaging technique that extracts electrical activity from raw electroencephalography (EEG) data to measure cognitive processes.

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sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

i think the answer is c hope this

yes, because even though a theory has a  lot of evidence to support it, it is not always true