Which of the Following Represents an Early Stage in Primary

Question

Which of the following represents an early stage in primary succession?  
A) Pine trees
B) Moss and lichens on bare rock
C) Weedy annual plants in an open field
D) Climax species in succession
E) Alder, cottonwood, and willow thickets

Accepted Answer

Moss and lichens on bare rock are the first plants to colonize during primary succession, as they can grow on rocks and begin to break them down to form soil. Pine trees and other climax species come later in the succession process, while weedy annual plants and alder, cottonwood, and willow thickets are examples of later successional stages as well.