Answer:
exonuclease
Explanation:
According to Oxford Languages, exonuclease is:
an enzyme which removes successive nucleotides from the end of a polynucleotide molecule.
it allows for nutrients to come into the cell using passive tranport aka moving anything on a gradient without the use of energy (ATP).
Extinction refers to the eradication of an entire Species. Hope this helped!
The answer should be 4) as it is known that uv radiation might have an effect on dna, thus causing mutations such as skin cancer in humans.
