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Chromosomes, Genes, and DNA dna, dna vs rna, dna, dna - 2, chromosome…
Chromosomes, Genes, and DNA 
There are 46 chromosomes in total but all of them are pairs, so there are 23 pairs.
In Nucleus, there are chromosomes which contains DNA
DNA which stands for deoxyribonucleic acid is molecules inside a person that contains information that is necessary to build a living thing. There are always 2 strands of DNA or a double helix. Source
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