I have to disagree, water-dwelling creatures are often the most well preserved due to the salinity of the water and the thick sediments on the sea floor that bury/fossilize skeletons.
I believe it is D. the species had survived for too long.
Sharks have existed and relatively remained the same for such a long time that shark fossils would not be good indicators of a certain time period.
A shark would not be a good index fossil because the species has survived for too long.
A shark would not be a good index fossil because the species has survived for too long. Index fossil are basically used to make study and identify about its nature, geographic periods. The formation of index fossil is made through the preserving animal or plants on the rock record of Earth.
Although the oldest of these shark-like scales is 480 million years old, the oldest complete shark fossil, Cladoselache, is only about 360 million years old. Older but quite incomplete fossil sharks are known, from Canada, around 400 million years old.
This implied that sharks most likely evolved from ancestors that had much more bone in the skeleton. The evolution of modern sharks was driven by their loss of bone, which suggested they are not as primitive as previously thought.
The correct answer is option D.
Learn more about index fossil, refer:
https://brainly.com/question/3868217
#SPJ2
