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Cell,tissue,organ,and organ systems
According to <span>Chargaff's Rules, concentration of adenine is equal to the concentration of thymine. Therefor if adenine= 40% thymine= 40%.
BUT this only works for double strand DNA.The possibility of Adenine= 40% and Thymine= 60% is only in a single stranded DNA molecule.
Hope I helped</span>
