逆境分为生物逆境（biotic stress）和非生物逆境（abiotic stress）。

If the abiotic theory is true, oil prices will soar and there will be competition for oil even war to solve the conflict caused by oil.

Which of the following is not the main abiotic factor affecting plant growth and development？ A: Water B: Temperature C: Light D: Insects

The ecological niche of a species refers to: A: Position of the organism in the food web B: Role in the community and all associated biotic and abiotic factors C: Mode of reproduction and food habits D: Behavior in relation to other species in the community

The following statement,whichis true() A: The ecosystem consists of animals, plants and microorganisms B: The ecosystem is composed of autotrophs, heterotrophs and syntrophs C: Theecosystems consist of plants, herbivores, carnivores, and scavengers D: Theecosystems consist of producers, consumers, decomposers, and abiotic environments