A chemical leaks into a pond that selectively kills off the phytoplankton (a producer). Many of the other organisms in the pond die over a short period of weeks, and the overall species diversity declines. The phytoplankton in this pond could be considered a good example of .

1) A keystone species
2) An edge species
3) An indicator species
4) A core species
5) None of the above

Which of the following best summarizes the idea represented by this graph?

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How is the city of savannah related to the union strategy of a full blockade of confederate ports? a) savannah was the last port needed to be secured in order to totally blockade the coast of georgia. b) savannah was the least significant city in georgia, and the union strategy centered on securing atlanta and capturing the tennessee river. c) savannah was the least significant city in georgia, and the union strategy centered on securing atlanta and capturing the chattahoochee river. d) savannah was the most significant port in georgia, and the union strategy centered on securing bases at savannah and the outlying islands to fully blockade georgia.