6. what does the seawifs satellite measure in the surface waters of the ocean?
7. during the streaming video, david attenborough described the sargasso sea as: a) a highly productive but simple ecosystem b) the most dangerous place to study in antarctica c) home to the grand banks fisheries d) one of the least fertile stretches of the ocean
8. the pacific equatorial upwelling ecosystem exhibits: a) a simple food web b) productivity throughout the year c) productivity only along coastlines d) krill and capelin at the base of the food chain