Fish lay thousands of eggs in one reproductive cycle. what are some facots that prevent the majority of these eggs from developing into fish that then reproduce on their own?

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

oxygen +1 most likely

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answer increasing the intensity, duration,and frequency of exercise progressively;