Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'indicator species'?

A. Deposition is the geological process by which material is added to a landform or land mass. Fluids such as wind and water, as well as sediment gravity flows, transport previously eroded sediment, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment. [Wikipedia]
B. An the concept is any biological species that defines a trait or characteristic of the environment. For example, a species may delineate an ecoregion or indicate an environmental condition such as a disease outbreak, pollution, species competition or climate change. the concept can be among the most sensitive species in a region, acting as an early warning to monitoring biologists.
C. Aerosol having its origin over the continents with industrial, urban, agricultural, forest, and desert sources, with potential for high concentrations of hygroscopic aerosol.
D. Spatial allocation is primarily concerned with designating what kinds of activities can or will be done where on the landscape. Land-use zoning is a typical example of a spatial allocation problem in which the landscape is divided up into a set of multiple alternative uses such as industrial, commercial, residential, etc. Allocation to a particular use usually depends on intrinsic properties of the individual parcels as well as adjacency constraints.

Answer: An the concept is any biological species that defines a trait or characteristic of the environment. For example, a species may delineate an ecoregion or indicate an environmental condition such as a disease outbreak, pollution, species competition or climate change. the concept can be among the most sensitive species in a region, acting as an early warning to monitoring biologists.