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Organisms might compete for food, pH, temperature, territory, and water.
The liver breaks down many substances in the blood, including toxins. The liver also excretes bilirubin — a waste product of hemoglobin catabolism — in bile. ... The lungs are responsible for the excretion of gaseous wastes, primarily carbon dioxide from cellular respiration in cells throughout the body.
Mass and distance
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More oxygen becomes available in the water helping the marine or freshwater creatures live. <span />
All of these are not part of the life cycle. It's man-made. Think of it in biology terms - something that's created genetically.
