Each step in the FOOD CHAIN contains appropriate numbers of organisms
If one group becomes too numerous, the chain becomes UNBALANCED
Each step in the FOOD CHAIN contains appropriate numbers of organisms
For example, agricultural runoff creates a SURPLUS of nutrients which can cause sudden INCREASES in algae growth
Each step in the FOOD CHAIN contains appropriate numbers of organisms
Too much algae blocks sunlight from reaching vascular plants
Each step in the FOOD CHAIN contains appropriate numbers of organisms
Too few plants means LESS FOOD for herbivores
