I think the scientist distinguish whether an entity is living or non living be describing the single unit of life, the live cell that could multiply, reproduce and generate trough time also through ages. I hope you are satisfied with my answer and feel free to ask for more 
        
                    
             
        
        
        
Some individuals in the rabbit population must evolve traits that improve their survival chances
        
             
        
        
        
Find the sunny spot, dig and loosen up the soil, mix the nutrients, plants the seeds , and finally water them well.
        
                    
             
        
        
        
It would lower the pH, raise the acidity of the water, and it would kill off a lot of marine life if it got too high. As species begin to die their predators follow, and this could cause mass extinction.
        
                    
             
        
        
        
Evolution is the change in an animal over time. Evolution causes this one animal to branch out into many different species of animals. 
How evolution starts- There is a mutation in the genes of one animal. If the mutation helps the animal, than the animal breeds and passes on this mutation. This is natural selection. Natural selection is the starting point of evolution because all of the helpful mutations get passed down to change the species over time for the animals' benefit.
I really hope this helps you