The Following Figure Illustrates How,although Pines First Established Themselves as the Dominant

question 68

Multiple Choice

The following figure illustrates how,although pines first established themselves as the dominant tree in the Lake Michigan sand dune community,black oaks ultimately became the dominant species.

What best explains the gradual reduction of the pine?

• A) Oaks trap sand,causing the dune to level out;pines can only survive in the low,protected areas between the dunes.
• B) Pine needles and the shade from existing pines improve the soil composition and moisture,allowing oaks to become established and preventing new pines from surviving.
• C) Pines replace the grasses,but this destabilizes the dune and increases the amount of moving sand;the loss of pines is not related to the presence of the oaks.
• D) Actually,oak seeds were always present in the sand;they simply require more time to germinate.

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