Non native species are organisms that do not naturally occur in a given area. They may have been transferred either accidentally or deliberately from their place of origin to the new area through human activities.
Non native species may become invasive species if they cause harm to the economy, human health, or environment.
Control methods used to eliminate invasive species are: 1) mechanical - physically removing the invasive species or changing the habitat condition of the affected area. 2) chemical - using of pesticides, fungicides, or herbicides to kill off invasive species. 3) legislative - introducing the natural enemy of the invasive species. It may be a predator or parasite that is from its native range.
An improper fraction is a fraction in which the numerator (top number) is greater than or equal to the denominator (bottom number). Fractions such as 65 or 114 are “improper”.
