The answer to ur question is A
The Chondrichthyes are the cartilaginous fishes including the sharks, rays,<span>skates and chimeras. The Osteichthyes are the bony fish. Both of these groups </span>became established during the Devonian Period about 400 million years ago. The Chondrichthyes <span>differ from the Osteichthyes in many respects, including their</span><span>
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C. your core will be made of protons will be made of protons and neutrons while being surrounded by "shells" of electrons.
The correct option is D. all of the above
