Sacred groves are tracts of forests conserved by people due to religions, cultural beliefs that emphasize protection of nature. Khasi hills, Meghalaya is one such area. Threatened animals, taken out from natural habitats are given special care at a special setting- Ex-situ conservation. Zoological park is one such way of conservation. Nile perch(fish) introduced in lake Victoria, Africa-led to extinction of more than 200 species of native, cichlid fish. So, Nile perch is example of Alien species invasion. Amazon forest covering more than 14% of earth's land surface, release large amount of O2.