Gametogenesis produces human egg and sperm cells
        
                    
             
        
        
        
The mechanism in which organisms best suited for their environment survive
and reproduce <u>NATURAL SELECTION.</u>
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Explanation:
When individuals in a population compete for resources or live in their environment, the individuals with the slightest advantage over the others have an increased chance of reaching maturity and  reproducing to passing down their genes to the next generations.
Natural selection works on the variations of the population to ‘select’ the best alleles of genes in the population that offer an advantage in ‘survival for the fittest’. This how natural selection fits a population to its environment. The greater the variation within a population, the higher its capacity to adapt to changes in the environment. 
Learn More:
For more on natural selection check out;
brainly.com/question/1184863
brainly.com/question/875198
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Answer:
Energy is moved through the ecosystem through your mom