The population ecologist is trying to determine the density of the oak trees in a forest. It is a part of the job of a ecologist. By detecting the density of the oak trees, an ecologist can easily determine whether the density of the oak trees are decreasing or increasing with time and what are the steps that need to be taken to keep the balance.
        
             
        
        
        
Answer:
 independence, marriage, parenting, launching, aging
Explanation:
The cycle begins with <em>independence</em> when an adult leaves his parents and becomes an unattached individual, then comes<em> marriage</em>, when an individual connects with another person and they commit forming a marital system, then comes <em>parenting</em> when they have children and focus on bearing them until <em>launching</em> stage comes, meaning their offspring becomes unattached adults and finally comes <em>aging</em> were the marriage can focus on themselves and their future years to come.
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It is called an autotroph.
        
             
        
        
        
Answer:
the second one is 1, the first one is 3, the last one is 5, the fourth one is 2 and the third one is 4
 
        
             
        
        
        
An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.