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Q.

The difference between rays and sharks is 
 

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a

 Tail fin design

b

The location of the gill slits

c

The position of the mouth

d

Tthe scales they use

answer is B.

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Detailed Solution

Rays have a flattened, disk-like body with five-gill openings and a mouth on the underside, which distinguishes them from sharks. Rays are distinguishable from sharks by their fins that extend forward along the sides of the head just above gill openings and are much larger than sharks'.

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