Assertion : Almost all (99.9%) nuceotide bases are exactly the same in all people.
Reason : The human genome consists 3164.7 billion nucleotide bases.a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If both assertion and reason are true but reason is not the correct explanation of the assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Sure, here are the step-by-step solutions: 1. The statement "Almost all (99.9%) nucleotide bases are exactly the same in all people" means that out of the 3164.7 million nucleotide bases in the human genome, 99.9% of them are the same in all individuals. 2. To find out how many nucleotide bases are the same in all people, we can use the following formula: number of identical nucleotide bases = (99.9/100) x 3164.7 million 3. Simplifying the formula gives: number of identical nucleotide bases = 3161.54 million 4. Therefore, almost all nucleotide bases (i.e. 3161.54 million out of 3164.7 million) are exactly the same in all people.