True or false the effects of a magnetic feild can be observed using non-metal filling

The use of dna as evidence in criminal investigations became possible because of the

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Along what geographical feature are most of the oil producing regions located