I'm not entirely sure what you mean, but a fit animal is one that is able to out-compete with other animals in its ecosystem. It possesses some kind of advantage, which makes it easier to compete with others for food, water, shelter, and mates. Due to these qualities, the animal is obviously able to live for a good deal of time and have a greater chance of producing viable offspring. 
        
             
        
        
        
Answer:
Chemical energy is energy stored in the bonds of atoms and molecules. ...
Mechanical energy is energy stored in objects by tension. ...
Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together.
Explanation:
 
        
                    
             
        
        
        
DNA is a nucleic acid molecule that undergoes a replication process to form a new daughter strand. The blue segment is the parental strand, and the yellow is the daughter strand. 
<h3>What is replication?</h3>
Replication is the process of the central dogma that duplicates the copy of the parent strand into new daughter strands. The two helixes of the parent strand get separated to make the complimentary copy of the new strand.
The daughter DNA is semi-conservative and are complementary structure made from the duplication of the parent strand with the help of the replication enzymes. 
Therefore, the daughter strands are the semi-conservative copies of the parental strand.
Learn more about replication here:
brainly.com/question/16464230
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Answer: The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming. Due to human activities, populations of many species have become small and isolated.
Explanation:
 
        
             
        
        
        
That is called "Alleles." They are slightly different versions of the same genes.
~Deceptiøn