<span>D. Lancelet, are examples of an invertebrate chordate:)</span>
One million nine hundred eighty-nine thousand
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Answer:
The hardness rating is 4.
Explanation:
Calcite sits at a hardness rating of 3 and is very easily scratched with a knife and/copper coin. This is where most Marbles, limestones, travertines, rate.
Meanwhile, Fluorite sits at hardness 4 and can be scratched by a knife.
It's Out Of C Or D Because It Explains It