Which sentence is punctuated correctly?

A. Fish spend their entire lives in water; there are millions of varieties of them.
B. Fish spend their entire lives in water, there are millions of varieties of them.
C. Fish spend their entire lives in water, the study of fish is called "ichthyology".
D. Fish spend their entire lives in water; the study of fish is called "ichthyology".

I think its D because its two closely related topics so use a semi colon but again NOT sure at all please help and a comma wouldn't make sense to use

2 answers

C and D are incorrect because of the placement of the period at the end. It should be before the ending quotation marks.

So … A or B? What do you think?
if still not sure, read up on comma splices ...
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