As shown in the following graph,selected intertidal communities along the Washington coast changed when the sea star Pisaster ochraceus was removed.After 10 years,how did those communities compare to control communities?

A) The communities were statistically indistinguishable from one another.
B) Without sea stars,the total number of species declined.
C) Other predatory sea stars replaced Pisaster.
D) Some populations declined,but species diversity was unaffected.

Question

As shown in the following graph,selected intertidal communities along the Washington coast changed when the sea star Pisaster ochraceus was removed.After 10 years,how did those communities compare to control communities?

A) The communities were statistically indistinguishable from one another. 
B) Without sea stars,the total number of species declined. 
C) Other predatory sea stars replaced Pisaster. 
D) Some populations declined,but species diversity was unaffected.

Quizplus · Accepted Answer

The graph shows a decrease in the total number of species in the selected intertidal communities along the Washington coast after the removal of Pisaster ochraceus. Therefore, the best choice is B, which states that without sea stars, the total number of species declined. The other choices are not supported by the information provided in the graph.

As Shown in the Following Graph,selected Intertidal Communities Along the Washington