Which is the worst form of marine pollution? (2 points)
1)effects of oil in the oceans
2)slowly degrading chemicals
3)coastal mining booms
4)improperly disposed trash save

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are