ecology 0.0 / 5 ? BiologyVariety of life and classificationIGCSEEdexcel Created by: Carlos52004Created on: 01-05-14 13:13 2783615910 Across 1. a lack of oxygen in water (14) 2. represents the total biomass of organisms at each trophic level (7, 2, 7) 5. animals are ... in the food chain (9) 9. organisms such as bacteria or fungi that break down and decompose deaad material (11) 10. all the organisms of a particular species living in an ecoystem at a particular time (10) Down 2. they produce food for photosynthesis (9) 3. a distinct, self supporting system of organisms interacting with each other and with their physical enviroment (9) 6. all the populations of living organisms living in a ecosystem at a particular time (9) 7. this gas causes acid rain (6, 7) 8. Nitryfing bacteria oxidise the ammonia to make nitrites and then to nitrates in a process called (13)
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