4 principles of evolution
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Genetic Variation: There are two different types of fish, orange fish and blue
Overproduction and Struggle for survival: since the fish can lay more than 1000 eggs not all 1000 babies are going to survive. Since there is a limited source of food some will die of starvation.
Differential survival and reproduction: The fish that are orange have less of a chance surviving than compared to the blue fish.
change in the gene pool: since the orange fish get eaten more there will be more of the blue ones than the orange ones. Because of mutations there will be genetically different fish.
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