Answer:
for plants ..
Use natural pesticides
Clever plant combining or making your own natural pesticides using everyday food items such as garlic and pepper are a great way to combat invasive species without harming the environment or your health.
for animals..
Protection of natural habitats,
Maintenance of the viable number of species in protected areas,
Establishment of Biosphere Reserves,
Protection through legislation,
Imposing restriction on export of rare plant and animal species and their products,