The answer is D. two birds of the same or different species living in the same area
<span>Competition is an interaction between members of the same species or between different species living in the same area. If resources, such as food, water, sunlight, territory,  are limited and several species depend on these resources, then, they must compete with the same or other species to gain the resources. </span>
 
        
        
        
Answer:
DNA contains the instructions to help the cell survive. They help the cell produce protein in the stages of protein synthesis.
 
        
             
        
        
        
Answer:
The evidence suggests that these chloroplast organelles were also once free-living bacteria.
Explanation:
The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them.
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Answer:
A. Fuel. 
Explanation: 
Coal is extensively used as a fuel in many countries for the production of electricity. When coal is heated, the heat energy is used to convert the liquid water into steam which is used to move turbines in the electric power plant. When these turbines moves, the electricity is produced. This fossil fuel is also used for warming of rooms and cooking delicious foods. 
 
        
             
        
        
        
It carries oxygen to the rest of the body. It can also remove carbon dioxide.