Which of the following represent ecosystems with high average annual net primary productivity?
A) Algal beds, reefs, tropical rain forests, swamps, and marshes
B) Open ocean and continental shelves
C) Boreal forest, temperate grasslands, and tropical dry deciduous forest
D) Estuaries, tundra, lakes, and streams
Question 2
In the winter in North America, the common cold often shows
A) high morbidity but low mortality.
B) high morbidity and high mortality.
C) low morbidity but high mortality.
D) low morbidity and low mortality.
The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after
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Climate change affects organisms and ecosystems
Primary motor area of cerebral cortex