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 61037924815 Across 1. A method of using either a pathogen, predator or parasite to control a pest. (10, 7) 5. A pyramid that is ALWAYS pyramid shaped. (7, 2, 6) 7. A square piece of equipment that can be used to estimate population density and frequency (7) Down 2. The final electron acceptor of respiration (6) 3. A pyramid that shows the number of individuals in each trophic level (7, 2, 7) 4. The process that converts fossil fuels back into atmospheric CO2. (10) 6. The process of converting ammonium compounds into nitrates, then nitrites. (13) 8. The role of an organism within it's comunity (5) 9. adenosine triphosphate (3) 10. The number of individuals of one species. (10)
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