Determine the stability of each ecosystem

1. An ecosystem comprising inhabitants that mate with dissimilar species will be steadier. The breeding with unassociated species will develop the tendency to face any tragedy and the occurrences of extermination of any species will become very negligible.  

2. An ecosystem, which possesses less species at each trophic level will be less stable due to less biodiversity. Biodiversity is equivalent to the steadiness of the species.  

3. An ecosystem comprising populations, which mate with only associated species is also less stable as it makes an ecosystem unstable. As it anything occurs to the ecosystem like change in climate, the species will not be able to get evolve and will immediately lead to extinction.  

4. An ecosystem comprising several species at every trophic level will be stable as biodiversity is equivalent to the steadiness of the species.  

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i wish i could with all of them i can barley see the first one so here's the answer to the first one b