Answer:
A frame shift mutation (also called a framing error or a reading frame shift) is a genetic mutation caused by indels (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three.The earlier in the sequence the deletion or insertion occurs, the more altered the protein.
Explanation:
I am pretty sure the answer is Uracil :))
Not always, the toxins may have been absorbed by the body and released in urine
