Exam 16: Fishes

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The gills of bony fishes are covered with a movable flap called the _________.

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Teleost fishes have a type of tail that is referred to as a _______ tail.

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Adult eels from both Europe and North America swim enormous distances to spawn at great depth in the __________.

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Experiments have shown that homing salmon are guided upstream by the characteristic ________ of the parent stream.

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The cartilaginous fishes are believed to have evolved from ancestors having well-developed bone.

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Hagfishes

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Among the fastest swimmers,tunas swim by

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The function of the spiracle in the skates and rays is for

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The _______ hypothesis suggests that the vertebrae in hagfishes are rudimentary in embryos so vertebrae were present in the common ancestor for all living vertebrates.

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Research by Hasler and others showed olfactory imprinting guiding migrating salmon.

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The chimaeras

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In the elasmobranchs,the sexes are separate and fertilization is ________.

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A lobe-finned fish thought to have been extinct for 70 million years,but discovered off the coast of South Africa in 1938,is the _____________.

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The ammocoetes is the larval form of a

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Sharks have

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Teleosts have either cycloid or ________ scales.

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Members of the Chondrichthyes had ancestors with dermal armor,but have a skeleton composed of _____________.

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