They are among the only types of organisms that get their energy from a non-living thing, and they give energy to Primary consumers, which give energy to secondary consumers, which give energy to tertiary consumers, which can give energy to decomposers, etc.
        
             
        
        
        
Answer is C A 20kg object
        
             
        
        
        
Natural selection is the idea that  organisms that posses favorable traits that enable them to survive in their environment are the ones that live long enough to pass on these traits to their offspring. 
<h3>What is natural selection?</h3>
The question is incomplete but I will try my best to explain the idea of natural selection.
The term natural selection refers to the idea put forward by Charles Darwin that organisms that posses favorable traits that enable them to survive in their environment are the ones that live long enough to pass on these traits to their offspring. This is also called the survival of the fittest.
Learn more about natural selection: brainly.com/question/2725702
 
        
             
        
        
        
Normal sex cells will have 23 chromosomes
 
        
             
        
        
        
The answer for the above question is Mutation. 
Mutations are random spontaneous changes that occur suddenly in the DNA. A single mutation can have a large effect, however in may cases evolutionary changes are based on the accumulation of many mutations. The gene flow is any movement of genes from one generation to another and is an important source of mutation