BIO 150 Final - JMU Gobetz Accurate 100%(RATED A+)

Population - ANSWER A group of individuals that belong to the same species and live in the same area Purpose of variability within a population - ANSWER - some genetic variants have advantages over others - natural selection can act on variation (if needed) genetic divergence - ANSWER the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time, often after the populations have become reproductively isolated for some period of time. Speciation - ANSWER the formation of new and distinct species in the course of evolution. species richness - ANSWER the number of species in a given area species evenness - ANSWER the relative proportion of different species in a given area Diversity Index - ANSWER A numerical measure of species diversity that is derived from both the number of species (variety) and their proportional abundance. geographic variation - ANSWER Difference in variation between population subgroups in different areas. novel ecosystems - ANSWER new and previously unseen assemblages of plants and animals resulting from human modification of the environment, including climate change ecosystem services - ANSWER The process by which natural environments provide life-supporting resources Local Human-Mediated Causes of Biodiversity Decrease - ANSWER 1. Pollution 2. Land use change 3. Introducing invasives 4. Exploiting resources Ecosystem - ANSWER A biological community of interacting organisms and their physical environment.