During old-field succession, the graph clearly shows that the number of species increases with time. During what period of time is this rate of increase the greatest?
A) 0-20 years
B) 60-100 years
C) 40-60 years
D) 20-40 years
E) cannot be determined from this data
A
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America's largest estuary, the ____________________, has greatly reduced shellfish and fisheries harvests due to a high population, nonpoint source pollution, and the resulting eutrophication.
Fill in the blank(s) with the appropriate word(s).
Transnational migrants include both Mexican migrants to the U.S. and Hong Kong Chinese to Canada
Indicate whether this statement is true or false.
The majority of freshwater in the world is present as
A. aquifers. B. rivers and lakes. C. ice and glaciers. D. groundwater.
You are walking along the shoreline but the material under your feet isn't sand, but instead is large cobbles and you occasionally have to scramble around small boulders. You are on ________,
A) a coastal dune B) a wave cut terrace C) a beach D) a coral reef shoreface