a) Animals interact with
either same or different species for different reasons.
1.    
 Food and water
- Competition for food and water occurs when the sources
     of food and water are limited. 
- The more limited the resources, the more intense the
     competition.
- If the food abundant, animals do not need to compete
3.    
Shelter and territory
- Occur when animals are looking for shelter or defending
     their own territory.
- Need to be in control of certain territory that
     provides them with food, water and shelter. 
 
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