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Plants cannot move about (they are sessile), and whilst not having to forage for food because they are autotrophs, they will compete for light, space, water and nutrients.
They also experience more intense competition within a species (intraspecific).
It dominates life in the oceans and plays a huge role in the cycling of carbon on Earth.
These bacteria are so dominant that their combined weight exceeds that of all the fish in the world's oceans.