<u>Answer:</u>
Any ecosystem is designed with a particular necessity that drives it's entire organisms that is residing in the particular ecosystem. Invasion by other species would deprive the initial nutrients that are contained in an ecosystem for it's native species.
This in turn would gradually make the native species extinct. The ecosystem contains all the nutrients that are enough for its residents and it is perfectly balanced by the nature, but invasion of a non-native species would break the natural balance and create deficit.
We can say that the amount of time it takes a car to reach a certain velocity means that some have less air resistance than others.
The answer to this question would be: transisional epithelium.
Transitional epithelium can be found in an organ like the bladder that needs protection but also needs elasticity as they are repeatedly stretched. In transitional epithelium. Normal epithelium wouldn't have such elasticity as they are used to protection so their structure is more rigid.
