Meteorite impact is not a human activity. The activities which lead to biodiversity loss due to human intervention are :-

i) Habitat loss and fragmentation: The Amazon rain forest harbouring probably millions of species is being cut and cleared for cultivating soya beans or for conversion to grasslands for raising beef cattle.When large habitats are broken up into small fragments due to various human activities, mammals and birds requiring large territories and certain animals with migratory habits are badly affected, leading to population declines.

(ii) Over-exploitation: Many species extinctions in the last 500 years (Steller’s sea cow, passenger pigeon) were due to overexploitation by humans. Presently many marine fish populations around the world are over harvested, endangering the continued existence of some commercially important species.

(iii) Alien species invasions: When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive, and cause decline or extinction of indigenous species. Example - Nile perch introduced into Lake Victoria in east Africa, invasive weed species are carrot grass (Parthenium), Lantana and water hyacinth (Eicchornia), African catfish Clarias gariepinus -threat to the indigenous catfishes in our rivers.