What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.20.2.1Biodiversity as the number• Describe biodiversity as the number of different species that live in an areaSyllabus objective20.2.2Reasons for habitat destruction• Describe the reasons for habitat destruction, including: (a) increased area for housing, crop plant production and livestock production (b) extraction of natural resources (c) freshwater and marine pollutionSyllabus objective20.2.3Through altering food webs and food• State that through altering food webs and food chains, humans can have a negative impact on habitatsSyllabus objective20.2.4Undesirable effects of deforestation• Explain the undesirable effects of deforestation as an example of habitat destruction, to include: reducing biodiversity, extinction, loss of soil, flooding and increase of carbon dioxide in the atmosphereSyllabus objective