This website tells all and even has mathematical challenges. Species - individuals capable of interbreeding and producing viable offspring. Population - a group of individuals of the same species living in the same place at the same time. The change in the frequency of moth forms in this case is an example of natural selection . Evolution - change in heritable traits in a population over successive generations.
High mountains are climatic islands with temperatures comparable to northern areas.
Disjunct northern species 4. Many rare, endemic and disjunct tropical species 5. In each of these forest types, many different microhabitats exist. Organisms may be found in the soil, on the forest floor, at the shrub layer, in the understory, or at the top of the forest in the canopy. The southern Appalachians have the greatest number of tree species in North America and is the salamander capital of the world.