Invasive Species-harmful aliens including predators disease and competitors and displace native species ex. tropical ash tree

Habitat Loss-including that comes by humans induced climate change ex.harvestingforest fires

Pollution-a substance that is harmful to the enviroment ex.chemical and radioactive pollution

Population-over a population of organisms of one species that interbreed and live in the same place at the same time ex.deforesting the Amazon for land

Overuse of land and harvesting-excessive hunting ex.Due to deforestation many organisms loose their habitat and tourism