Respuesta :
It doesnt have structures that can be preserved in a fossil.
Explanation:
I'm assuming you're on Pennfoster cause me too.
4 options I'm not sure so correct me if I'm wrong
1. No fossil records exist for sharks.
( we have ancient shark teeth )
2. Salt water would degrade the fossil over time
(Idk maybe)
3. The species has survived too long
4. It doesnt have structure that can be preserved in fossil
( sharks are mostly collagen which doesnt preserve well, except teeth)
I'm about to submit my test I'll edit if I'm wrong.
Edit . I'm wrong
The shark cannot be considered as a good indicator for fossil study. Because the species is known to have survived for a very long period of time.
Explanation:
Fossil studies are done by determining the age of the fossil preserved strata or rock. This is done in order to determine the period of time in which a species found as fossil presence.
Sharks have been known to have survived for a very long duration of time. And, therefore, do not corroborate to a specific period of time. Graptolites and Ammonites are considered as the best index fossils.
