What Statement Accurately Summarizes the Changes in the Distribution of A

question 10

Multiple Choice

What statement accurately summarizes the changes in the distribution of A. arbustorum around Basel between 1900 and 1990?

• A) In 1993, A. arbustorum was found at all the same sites surveyed in the early 1900s, but at much lower densities.
• B) In 1993, A. arbustorum was not found at 8 out of the 29 sites surveyed in the early 1900s.
• C) In 1993, the sites where A. arbustorum was found were cooler and had lower elevations than the sites where the snail was not found.
• D) In 1993, 8 of the 16 sites where A. arbustorum was not found had suitable vegetation but were close enough to urban areas to experience higher temperatures.

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