Divemaster Final Exam A part 2 Questions and Answers with complete solution

Divemaster Final Exam A part 2 Questions and Answers with complete solution What is the ocean's major source of productivity and the base of the marine food chain? a. Krill b. Seagrass c. Coral d. Phytoplankton d. Phytoplankton True or False. Natural processes, such as earthquakes and storms, are much more of a severe threat to coral reefs and wetlands than human-induced threats, such as pollution. False. True or False. When an alien (invasive) species is introduced into an ecosystem, it may have no natural enemies, which allows it to quickly multiply and possibly overtake and kill off native species. True. A _______________ exists when relatively warm, low-density surface water is separated from cool, high-density deep water. a. freshwater layer b. thermocline c. downwelling d. rip current d. thermocline If you stand on a beach and watch water generally moving down the coast, pushed by waves approaching the shore at an angle and assisted by the prevailing wind, you are looking at a _______ current. a. rip b. tidal c. longshore d. upwelling c. longshore