Answer:
The right answer to this question is: different codons sequences
Explanation:
The production of a protein is a little bit complex, it all starts on the nucleus of a cell, with the polimerase RNA reading a single ribbon of DNA, making new base pairs, matching them and changing Thymine to Uracil. After that, outside the cell, this mRNA will be read in the ribosome again, but now specifically, to one function, based on codons. Codons are a sequence of 3 nucleotides, but they're not random, it depends of what the body needs to survive.
That's why there's so much variation, for example, we don't have the same needs as a butterfly, or a shark, they produce different codons and by that way they can develop their characteristics.
