AQA A2 Biology: Unit 4 crossword 4.5 / 5 based on 6 ratings ? BiologyUnit 4A2/A-levelAQA Created by: rioashcroftCreated on: 25-11-15 12:07 10374126859 Across 1. A change in an ecosystem, overtime, of the species that occupy it due to a change in abiotic factors (10) 5. adenosine triphosphate (3) 7. The role of an organism within it's comunity (5) 8. A square piece of equipment that can be used to estimate population density and frequency (7) 9. succession that occurs when soil is already present, for example after a forest fire. (9, 10) Down 2. When both organisms benefit from a relationship between them, it's called a __________ relationship. (9) 3. The process of converting ammonium compounds into nitrates, then nitrites. (13) 4. In anaerobic respiration, this substance accepts the Hydrogen to form lactic acid. (8) 6. The final electron acceptor of respiration (6) 10. A species that can colonise bare rock or ground. (7)
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