Give any two examples of xerarch succession.

(N/A) Xerarch succession refers to the process of ecological succession that begins in extremely dry or xeric environments. Two common examples include:
$1$. Succession on bare rock (Lithosere): This begins with the colonization of crustose lichens on bare rock surfaces,eventually leading to the formation of soil and the development of a climax community.
$2$. Succession on sand dunes (Psammosere): This occurs in sandy areas where water availability is very low,starting with pioneer species like grasses that stabilize the sand and facilitate the transition to more complex plant communities.