The graph here shows the population sizes of different kinds of plants during
primary succession.
Abundance
100
80
6
40
20
0
Changes in Abundance
Time
I Lichens & mosses
Annual plants
Perennial plants
Shrubs & grasses
Small trees
Mature trees
Which statement best describes how this ecosystem changes during primary
succession?
OA. Lichens and mosses decrease during the earliest stage.
OB. Shrubs and grasses increase during the middle stages.
OC. Annual plants increase as small trees decrease.
OD. All types of species disappear during the earliest stahe.