What did charles darwin mean when he stated that some organisms were 'more fit' than other organisms?

He meant that certain organisms were able to survive and reproduce organisms that were also fit
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Ifound this on google “concept 13: meiosis ii: telophase ii. a nuclear envelope forms around each set of chromosomes and cytokinesis occurs, producing four daughter cells, each with a haploid set of chromosomes. a nuclear envelope forms around each set of chromosomes.” i hope this you for what your looking for.