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Plants and animals require nitrogen in order to produce proteins and nucleic acids (DNA and RNA) About 78% of the atmosphere is actually nitrogen gas but plants and animals cannot access the nitrogen in this gaseous form. The phloem has structural features Revision notes on 2. Edexcel IGCSE (9-1) Biology: Revision Notes Edexcel IGCSE (9-1) Biology > Revision Notes Concise revision notes for the Edexcel IGCSE (9-1) Biology course. Exam paper questions organised by topic and difficulty. When oxygen runs out, glucose is broken down without it Biology IGCSE Revision Notes. Cells specialise by undergoing differentiation: this is a process by which cells develop the structure and characteristics needed to be able to carry out their functions. June 2019 Pearson Edexcel Biology Past Exam Papers (1BI0) June 2019 Biology Paper 1 (1BI0/1F) – Foundation Tier. Organisation. 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