Answer:
Population size of elk increased while the population of aspen tree declined.
Explanation:
As per question, removal of wolves from the system would result in increased elk population due to absence of its predator (wolves). The increased elk population would extensively feed on  shrubs and trees like aspen and cottonwood trees. This would cause decline in population size of these shrubs and trees. 
 
        
                    
             
        
        
        
Answer:
It might become wet land over time. (It might also change migration) 
Explanation:
 
        
             
        
        
        
Answer and Explanation:
Consists of the brain and spinal cord
- central nervous system
Consists of the nerves outside the brain and spinal cord
-peripheral nervous system
Collects information from sensory organs
-peripheral nervous system
Processes information from sensory organs-central nervous system.
The CNS is made up of the brain and the spinal cord. The PNS consists of nerves, which link the CNS to various receptors and effectors.