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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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

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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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		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