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

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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?
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.


Definitions:

Uniform Distribution

A type of probability distribution where all outcomes are equally likely; in a continuous uniform distribution, any value within a specified range is equally likely to occur.

Standard Normal Variable

A random variable that has a normal distribution with a mean of zero and a standard deviation of one.

Random Variable

A variable whose possible values are numerical outcomes of a random phenomenon.

Standard Normal Variable

A normal random variable with a mean of zero and a standard deviation of one; used as a basis for comparison with other normal distributions.

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