Because Disaccharides have more chemical bonds.
A. deoxyribose + phosphate group + thymine
The services that will be provided to the patient are for health promotion and accident and illness prevention.
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The advantageous proteins that build larger molecules help prolong life life. If there is better survival and reproduction, it is more likely to pass onto the next generation. If it continues to be advantageous, the sequence of them change to support the life of the current species.