Unit 6 ch 15 s3 animals & agriculture Unit 6 ch 15 s2 pest control Unit 6 ch 15 s2 crops & soil Unit 6 ch 15 s1 feeding the world Unit 6 ch 14 s3 land management & conservation Unit 6 ch 14 s2 urban land use Unit 4 ch 17 s2 nuclear energy Unit 4 ch 17 s1 energy resources & fossil fuels Unit 3 b ch 10 s3 future of biodiversity Unit 3 b ch 10 s2 biodiversity at risk Unit 3 b ch 10 s1 what is biodiversity Unit 3 a ch 9 s2 changing population trends Unit 3 a ch 9 s1 studying human populations Unit 3 a ch 8 s2 how species interact with each other Unit 3 a ch 8 s1 how populations change in size 
