Environmental Science
Which one is true?

symbiosis when the interaction is useful to both the populations
symbiosis when neither population affects each other
commensalism when none of the interacting populations affect each other
commensalism when the interaction is useful to both the populations

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP