What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.18.3.1Extinction causes• Extinction causes:- Climate change- Competition- Hunting by humans- Habitat degradation and lossSyllabus objective18.3.2Reasons to maintain biodiversity• Reasons to maintain biodiversitySyllabus objective18.3.3Ex situ and protected-area conservation• Conservation roles: zoos, botanic gardens, conserved areas (national/marine parks), 'frozen zoos', seed banksSyllabus objective18.3.4Assisted reproduction in endangered mammals• Assisted reproduction in endangered mammals: IVF, embryo transfer, surrogacySyllabus objective18.3.5Invasive alien species• Reasons for controlling invasive alien speciesSyllabus objective18.3.6Conservation organisations• Conservation organisations: IUCN, CITESSyllabus objective