The class ____________ is composed of vertebrates having placoid scales,a heterocercal caudal fin,a ventral mouth,and a cartilaginous endoskeleton.
Correct Answer:
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Q18: Cartilaginous fishes
A)lost the heavy dermal armor of
Q19: Shark characteristics include
_ having internal fertilization.
_ having
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
Q24: To replace water lost osmotically,marine fish
A)pump water
Q25: In the elasmobranchs,the sexes are separate and
Q26: Marine bony fishes are
A)hypoosmotic regulators.
B)in osmotic equilibrium
Q27: The primary propulsive mechanism of a fish
Q28: Sharks remove excess sodium chloride from blood
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