How are scientists certain that Megalodon is extinct when approximately 95% of the world’s oceans remain unexplored?

Question

Would like to understand the scientific understanding that can be simply conveyed.

Thanks you.

In: 5134

Answer 1

Teeth! That’s the only reason we know of them, and there’s only a certain window in time where the teeth come from.
There’s a roughly 3 million years ago to now timeframe that hasn’t shown up any teeth (yet…)