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Listen to native speakers pronounce “single shell” in real conversational contexts with synchronized timestamps and subtitles.
And many, many index fossils are cephalopods or ammonites and the relatives of squid because they're so abundant, they're so diverse, and they're so easily recognized.A single shell can be identified to species quite easily by counting the ribs and figuring out various-- just taking morphometrics.Basically doing little measurements and saying it's wider than it is tall, or it's fatter than it is tall, and all of these things will give you the species.