1
a measure of the number of kinds of ecosystem present in an area
2
those species that could become extinct if a critical factor in their environment were changed
3
those species with population so small that they are in immediate jeopardy of becoming extinct
4
the process of changing the natural community to encourage the increase in populations of certain desirable species
5
a term used to describe the number of different kinds of genes present in a population or a species
6
a measure of the number of different species present in an area
7
the conversion of arid and semiarid lands into deserts by inappropriate framing practices or overgrazing
8
birds that fly considerable distances between their summer breeding areas and their wintering areas
9
activities that destroy forests
10
the process of replanting areas after the original trees are removed
11
a measure of the diversity of genes, species, and ecosystems present in a region
12
a forest harvesting method in which all the trees in a large area are cut and removed
13
the death of a species; the elimination of all the individuals of a particular kind
