Refer to the Table

question 19

Multiple Choice

Refer to the table.
The table contains data on the effects of symbiosis between a fly (host) and a fungus over many years. It shows the upper and lower bounds for the effects of the association; positive numbers denote net benefits and negative numbers denote net costs. (If zero is between the upper and lower bounds, consider the effect to be zero, since it is statistically indistinguishable from zero.)
-According to the table, in what year did the relationship between the fungus and the fly first become a mutualism?

• A) 1996
• B) 1999
• C) 2002
• D) 2005

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