Answer to Question 1
Introducing species into foreign ecosystems alter(s) community and population ecology relationships such as competition and predation. These problems can occur because an introduced species typically does not have predators, parasites, and/or grazers. A non-native plant may also release chemicals that exclude native species. A non-native species may find the environment favorable for survival but it is unlikely that it fits in the framework of relationships in the new biotic community.
Examples of exotic species include rabbits introduced into Australia, and chestnut blight, Japanese beetles, fire ants, gypsy moth, zebra mussel, kudzu, and spotted knapweed and purple loosestrife introduced into the United States.
Answer to Question 2
Territoriality refers to individuals or groups defending a territory against the encroachment of others of the same species. It is a form of intraspecific competition. By establishing a territory, a nesting area or adequate food resources are being defended against others' use. When populations are high some individuals are unable to secure nest sites or areas with adequate food resources, thus limiting the size of a population.
Insect species diversity on British host trees supports the area hypothesis.
Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta.
A taxonomy of the human species.
Proportional reasoning word problems
Linear programming problems using the simplex method.
Australia's spiny anteater, one of only three modern species of monotremes