The graph shows changes in percentage cover of four plant species on a sand dune ecosystem over 500 years.
Which of the following explanations cannot be supported using the information in this graph.
All four species never formed part of the same community
Beech grass became extinct after 100 years
Interspecific competition between conifer trees and shrub bunchgrass occurs leading to a decrease in shrub bunchgrass
Intraspecific competition results in a decrease in conifer trees after around 400 years
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