For questions 16–19, write true if the statement is true. if the statement is false, replace
the underlined word or words to make the statement true. write your changes on the line. 16. most oil pollution in the oceans comes from small, nonpoint
sources. 17. marine organisms at higher trophic levels contain higher levels of
mercury. 18. of the nutrients phosphorus and nitrogen, phosphorous causes
the most damage to oceans. 19. reducing oil seepage into coastal waters can lessen the frequency
of algal blooms.