reasons for species becoming endangered and cause of extinction

Question 1

what is an endangered species?

Answer 1

a species at serious risk of extinction

Question 2

what are the possible reasons for species becoming endangered by human impact?
5 of them

Answer 2

destroying habitats e.g deforestation, removing hedges, draining wetlands

pollution of the environment- e.g PBCs oils and pesticides

introduction of alien species to an ecosystem- species may outcompete native species for food and space, they may not have natural predators and grazers to control the population. thye may also carry diseases that affect native populations

monoculture- growing large numbers of the same genetically identical individuals in an area

building roads, houses , factories

unsustainable harvesting e,g overfishing and overhunting

Question 3

how does introduction of alien species to an ecosystem affect the native species ?

Answer 3

species may outcompete native species for food and space, they may not have natural predators and grazers to control the population. thye may also carry diseases that affect native populations

Question 4

what does extinction result in?

Answer 4

a loss of species and a decrease in biodiversity

Question 5

what can natural selection be a reason for?

Answer 5

extinction
during evolution various species are replaced by others