If you found a fossil fish and had dated it to 400 mya, what feature might indicate that it is actually younger that you first thought?

If you found a fossil fish and had dated it to 400 mya, what feature might indicate that it is actually younger that you first thought?

If you found a fossil fish and had dated it to 400 mya, what feature might indicate that it is actually younger that you first thought?



Answer: four limbs.