Answer:
The answer is C. Their cells have nuclei.
The difference between the meanings of combining forms spondyl/o and vertebr/o is spondyl/o and vertebr/o both mean vertebra. There is no difference because they are both vertebra.
Spondyl/o is a combining form meaning vertebrae. The two combining forms for vertebrae bones of the spine, are vertebr/o and spondyl/o.
I would agree with your answer of C. As there would need to be calcium to start with and they seem to come from the sarcoplasmic reticulum
Answer:
send me the link to that website and ill research it for you
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