Question

if the same base pairs are used to code for all organisms, why is there so much variation among organisms?
the order of the codons differs between organisms.
the order of the codons is the same between organisms.
the codons in each organism are the same.
the codons in each organism differ.

Explanation:

The genetic code is made up of codons (three - base sequences). While the same base pairs (A, T, C, G in DNA; A, U, C, G in RNA) are used across organisms, the order of codons in the DNA (which is transcribed and translated) varies. Different orders of codons lead to different sequences of amino acids during protein synthesis. Proteins are crucial for the structure and function of organisms. So, variation in the order of codons (not that the codons themselves are completely different in nature, but their order) causes variation among organisms. For example, a different order of codons can lead to a different enzyme being produced, which can have a significant impact on an organism's traits.

Answer:

The order of the codons differs between organisms.