More guides on this topic

• What happens during photosynthesis? - OCR 21st Century
• How do producers get the substances they need? - OCR 21st Century
• How do producers transport the substances they need?
• How are levels maintained within an ecosystem? - OCR 21st Century
• How are populations affected by conditions in an ecosystem?

Related links

• Combined Science exam practice
• Combined science revision
• Personalise your Bitesize!
• Jobs that use Science
• BBC: Science and Environment
• Save My Exams Subscription
• Quizlet
• Tassomai Subscription
• Headsqueeze
• Revision Buddies Subscription