A is your answer. Hope it helped!
GAGTTA is what you have.
CTCAAT is what you’ll get.
A matches with T, G matches with C, and U is only for translating out of the DNA sequence.
This question dose not have enough info to answer, i'll gladly help if this question had a date in which mercury was used or what had mercury in it.
I apologize.
D. Bacteria because “bacteria” is actually a domain itself
