Answer:
1: Population; 2: Biome;3: Ecosystem
Explanation:
Population refers to the number of people in a state. Biome is a large area characterised by it's vegetation, soil,climate, and wildlife. Ecosystem is a geographic area where plants, animals and other organisms exists
 
        
             
        
        
        
The classification of species includes: structure, shape, pattern, color, and physical traits. 
Can I have a brainliest?