A biologist compares how different ecosystems undergo
succession. she divides the series of events that happen
during primary and secondary succession into three
different stages. which feature might be used to distinguish
secondary succession from primary succession?
a. the lack of pioneer species in the second stage
b. the presence of soil and organic matter in the first stage
c. the presence of trees and large plants in the final stage
d. the presence of pioneer species in the final stage