What Once Was an Open Pasture on a Long Abandoned

question 3

Multiple Choice

What once was an open pasture on a long abandoned farm has changed over time,without the direct influence of humans.After the cattle had been removed,shrubs and bushes could be seen dotting the grass-covered hillsides.A few years later,small pine trees and then larger deciduous trees appeared.Now,there are so many trees and shaded regions it is difficult to tell that this was once a field.
-These ecological changes in the abandoned pasture represent

• A)aquatic to terrestrial succession.
• B)primary succession.
• C)intermediate succession.
• D)secondary succession.

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