Shark characteristics include
____ having internal fertilization.
____ having isosmotic blood (compared to that of marine water)due to high concentrations of urea and trimethylamine oxide.
____ having teeth of modified placoid scales.
____ being able to detect bioelectric fields.
_____ having a swim bladder to control buoyancy.
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Q14: The hagfish has a keen sense of
A)depth
Q15: Shark reproduction and development involves
A)clearing a bottom
Q16: The most primitive of the early fishes
Q17: Hagfishes
A)are entirely fresh water animals.
B)are parasitic.
C)have a
Q18: Cartilaginous fishes
A)lost the heavy dermal armor of
Q20: The cladistic use of the term "fish"
A)applies
Q21: In schooling,fish rely on sensitivity to vibration
Q22: The group designation _ was formerly considered
Q23: The class _ is composed of vertebrates
Q24: To replace water lost osmotically,marine fish
A)pump water
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