The ____________________ suggests that, on average, loss of 90% of the habitat in an area causes extinction of about 50% of the species in that area.
Fill in the blank(s) with the appropriate word(s).
species area relationship
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The United States currently has about ____________________ invasive species that were accidentally or deliberately introduced
Fill in the blanks with correct word
River bottoms and delta regions have a very deep topsoil layer.
Answer the following statement true (T) or false (F)
Lacrosse was adopted by European immigrants
A) who didn't have smooth playing fields to roll balls along. B) from Iroquois players. C) working in factories. D) attending college in the American Northeast. E) who wanted to invent a new sport.
The Columbia River dam system has benefited many people, but it has also ____.
A. sharply increased populations of invasive salmon B. sharply reduced populations of wild salmon C. sharply reduced populations of herring D. inhibited migration patterns of trout E. inhibited reproductive cycles of common carp