An ecoligical niche is a place or role than an organism plays in part of an ecosystem. Given the fact that living things have different competitive advantages it helps them survivie so they don’t all compete for the same resources.
The environment has made it difficult for some specieis to survvie. Temperature, elevation, salinity may all play a role in an organisms ability to survive.
In a forest vertical growth affects things. The less tall a plant has grown the more it is competing for resources ? Some animals eat different plants, whie other animals work synergystically with the waste products of the eco system. Seeing as though they exist in a different part of the eco system, they may inadvertently help each other co exist.