Invasive they destroy crops
It is not a native plant and it crowds out native plants.
Invasive plants uses natural resources originally used by native plants. In this way, invasive plants drives native plants out by depriving them of food and water. Over time, whole regions will be taken over by invasive plants, destroying the diversity of native plants and animal populations who depend on these plants to survive.
Customs checks help stop non-native species from invading and disrupting the native ecosystem. The invasive species may out compete the local species, or the invasive species may have no predators in the native ecosystem.
depends what country you stay in; they are native species in one country, but may be invader species in another
Selection pressure caused by the invasive species entering the ecosystem. They would be possibly competing for the same resources with different traits that might favor one species traits over the others on average. The native species is a population of variants, so some among the native population could compete with the invasive species on a more equal footing. These would be naturally selected by being reproductively sucessful, ultimately, and thus change the allele frequency in the native populations gene pool; the definition of evolution.
invasive
Red foxes are only considered invasive in Australia where they were introduced from Europe by early settlers. They are not natives of Australia and have no natural enemies there. The population exploded and the red fox started to decimate local native wildlife populations..
Not all non-natives are invasive. The Weeping Willow is not native to the Americas. Weeping willow Salix babylonica is a native of China and is not invasive.
Many types of butterflies are migratory. Therefore, they would be native, and NOT invasive.
A species is not inherently native or invasive. All species on Earth have a region to which they are native. If they are introduced to a new area, then they are invasive to that area. The orca has a cosmopolitan distribution, so it is native to oceans pretty much everywhere.
An invasive animal
No, raccoons are not an invasive species of the Everglades. They are native wildlife there.
Is the short sedge grasses native or invasive to a humid continental climate
Victor Ramey has written: 'Invasive and other non-native plants found in public waters and conservation lands of Florida and the Southeastern United States' -- subject(s): Identification, Invasive plants, Alien plants
It is not a native plant and it crowds out native plants.
It is not a native plant and it crowds out native plants.
There is no such thing as an "invasive koala". Koalas are not invasive as they are native to Australia, and have not been introduced to any other country.