Solved by a verified expert: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:Select one:a. secondary succession.b. intermediate succession.c. primary succession.d. aquatic to terrestrial succession.