Why does dna replication have such accuracy?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

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In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.