Answer:
#1 - Habitat destruction renders entire habitats functionally unable to support the species present; biodiversity is reduced in this process when existing organisms in the habitat are displaced or destroyed. The primary cause of species extinction worldwide is habitat destruction
#2 - All forms of pollution pose a serious threat to biodiversity, but in particular nutrient loading, primarily of nitrogen and phosphorus, which is a major and increasing cause of biodiversity loss and ecosystem dysfunction. In addition, nitrogen compounds can lead to eutrophication of ecosystems.
#3 - Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats.
#4 - Overexploitation means harvesting species from the wild at rates faster than natural populations can recover. Two birds that were victims of overhunting are passenger pigeons and great auks (a type of bird). Both were hunted to extinction.
#5 - The core threats to biodiversity are human population growth and unsustainable resource use. To date, the most significant causes of extinctions are habitat loss, introduction of exotic species, and overharvesting. ... Habitat loss occurs through deforestation, damming of rivers, and other activities.
