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Jaws first occurred in which group of fishes? ostracoderms sharks placoderms ray-finned fishes If a mollusk had a lung, where...

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Question

Biology

Jaws first occurred in which group of fishes?

ostracoderms

sharks

placoderms

ray-finned fishes

If a mollusk had a lung, where in the body would it belocated?

visceral mass

mantle

foot

radula

Which characteristic allows reptiles to thrive in deserts?

the larval form, which can go dormant when water isunavailable

the large number of prey and a limited number of predatorsavailable in deserts

a cartilaginous skeleton that provides needed flexibility forlocomotion on sand

keratin-infused scales that reduce water loss anddehydration

Answer & Explanation Solved by verified expert
4.2 Ratings (657 Votes)
1 Jaws first occured in Placoderms Placoderms were among the first jawed fish and their jaws evolved from the first of their gill arches Placoderms were a class of fish heavily armoured which first appeared during the Silurian about 430 million years ago 2If a mollusk    See Answer
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