Environmental Science
The concept that 'population tends to increase geometrically while food supply increases arithmetically' was put forward by

Adam Smith
Charles Darwin
Thomas Malthus
Stuart Mill

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

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

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