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 10836127549 Across 1. The act of splitting water using light. (10) 4. This will be low in a hostile environment. (12) 5. The first stage of respiration (10) 8. The final electron acceptor of respiration (6) 9. In anaerobic respiration, this substance accepts the Hydrogen to form lactic acid. (8) Down 2. A change in an ecosystem, overtime, of the species that occupy it due to a change in abiotic factors (10) 3. The role of an organism within it's comunity (5) 6. adenosine triphosphate (3) 7. A square piece of equipment that can be used to estimate population density and frequency (7) 10. A pyramid that shows the number of individuals in each trophic level (7, 2, 7)
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