Well for one the impact of age of course, is not limited to organisms. overtime your DNA accumulates damage.
Neck- the neck is close to the brain which the body wants to protect at all costs, therefore making this area extremely sensitive. It’s also an area that isn’t used to constant contact, which can dull nerves and grow calloused as feet are
I think that the worse the quality of the water is the more negative effects it is going to have on the salamanders and the better the quality of the water is the more positive effects it is going to have on the salamanders because the in other study’s the more polluted a body of water was the more defects animals had that used that body of water
B tolerance
hope i helped
This is because just like our fingerprints, no ones dna is exactly the same. We may have similarities with other people but they will never be exactly alike.