Environmental Science
The order of succession in a lithosere or xerosere is

Crustose lichen stage->Foilose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
Crustose lichen stage->Foilose lichen stage->moss stage-> ->shrub stage-> herb stage->forest stage (climax community)
Moss stage ->Foilose lichen stage-> Crustose lichen stage ->herb stage->shrub stage->forest stage (climax community)
Foliose lichen stage->Crustose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)

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Environmental Science
What is the cause of the Exxon Valdez?

Oil Tanker which sank in 1989 along the coast of Alaska and marine life seriously affected.
none of these.
a ship which wrecked on the coast of India
a plane which crashed and caused death of human life

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Environmental Science
The order of basic processes involved in succession is

Invasion-> Nudation->competition and co action->Reaction>stabilization
Nudation->Invasion-> competition and co action->reaction>stabilization
Invasion->stabilization-> competition and co action->Reaction>nudation
Nudation->stabilization-> competition and co action->Invasion>reaction

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