A) edge effect
B) keystone
C) succession
D) ecotone
Correct Answer: D
Solution :
An ecotone is a transition area between two adjacent but different communities, such as forest and grassland. The edge effect in ecology is the effect of the juxtaposition or placing side by side of: contrasting environments on an ecosystem. A keystone species is a species that has a disproportionate effect on its environment relative to its biomass. Such species affect many other organisms in an ecoystem and help to determine the types and numbers of various other species in a community. Ecological succession, a fundamental concept in ecology, refers to more or less predictable and orderly changes in the composition or structure of an ecological community.
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