<span />In short it's a membrane that receives vibrations from the air. That air is then transitioned into the auditory ossicles. Those are bones that I assume carry air. They are located in the middle ear cavity, which is know as scientifically; tympanic. c:
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The "limestone" is supported by the rock cycle.
Answer;
It is impossible to tell from the data provided.
Explanation;
Different animals can be categorized as either protostomes and deuterostomes based on certain features of their embryonic developments.
For those categorized as protostome; the features include; mouth from blastopore, spiral,determinate cleavage, and coelom from solid masses of mesoderm
Those categorized as deuterostome have features such as coelom from folds of archenteron, radial, indeterminate cleavage, and anus from blastopore.
