I believe the answer would be B.
Preserved footprints left behind by animals are called ichnites.
A neutron has no charge
<em>NEUT</em>RAL = NONE
well thats how I remember it anyway
SO ITS NUMBER 2
If you compare the original DNA with the mutated DNA, the first C got “substituted” by an A after the mutation.
So the answer is (C) substitution.