canthostega is an extinct amphibian, among the first animals to have recognizable limbs. It is a candidate for being one of the first vertebrates to be capable of coming onto land. It lacked wrists, and was generally poorly adapted to come onto land. The limbs could not support the animal's weight. Acanthostega had both lungs and gills, also indicating it was a link between lobe-finned fish and terrestrial vertebrates.
Ichthyostega is an early tetrapod. Being one of the first animals with legs, arms, and finger bones, Ichthyostega is seen as a hybrid between a fish and an amphibian. Ichthyostega' had legs but its limbs probably weren't used for walking, they may have spent very brief periods out of water and would have used their legs to paw their way through the mud.
Amphibia were the first four-legged animals to develop lungs.
Amphibians living today still retain many characteristics of the early tetrapods.
2006-06-30 09:54:06
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answer #1
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answered by johnslat 7
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The mudpuppy has gills and lungs, and the lungs are in fact functional. The fossil record shows animals like this millions of years ago. Frogs also have lungs, but are a more recent evolutionary development.
2006-06-30 11:31:28
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answer #2
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answered by But why is the rum always gone? 6
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i'd get a rabbit or 2 if I were on your position. A rabbit is a cuddly bushy animal that likes to be held and stroked. unlike a hermit crab they received't somewhat damage you. possibly a chew or a scratch yet that hardly takes position. Hermit crabs merely scare me because they pinch you and they received't enable flow. Rabbits are relitivly less costly too. All you're able to purchase is a cage, rabbit nutrients, a water bottle, bedding, and your noticeably a lot set. you will get a mini lop that are large in case you do not have a lot room for a larger bunny like a French lop, which weigh a minimum of ten pounds. Lops will be somewhat lovable with their ears searching a lot similer to hair on a human. Rabbits have their own personality same to a canine or cat does. Rabbits will be puzzling in case you do not comprehend what you're doing. additionally they opt to eat culmination and greens alongside with any un sprayed weeds on your backyard or backyard. Rabbits could also get somewhat excited and commence to run somewhat quick and its so lovable to ascertain them like that. nicely, as you'll discover I recconmend a rabbit as your small animal. ^_^
2016-10-14 00:18:25
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answer #3
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answered by Anonymous
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I KNOW I KNOW!!!! The fact is, nobody can know for sure. There are at least thirteen theory's that I know of regarding which animal was the first. A lot of them are types of birds, a few reptiles and a type of squid like invertebrate that lived a few hundred thousand years before the dinosaurs. But nobody knows for certain. If that's not the answer you were looking for, you have your information wrong. Check the source, they don't know squat.
2006-06-30 12:08:17
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answer #4
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answered by MED_SCHOOL 3
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What do you consider a lung? The gas bladders of fish, IIRC, are usually considered to be the origins of the lung.
2006-06-30 09:51:21
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answer #5
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answered by Tim 4
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the first reptiles to come out of the water and live on land
2006-06-30 09:51:08
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answer #6
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answered by Bk 2
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If you're a creationist then: Human (Adam & Eve)
If you're an evolutionist then: Amphibians.
2006-06-30 09:50:57
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answer #7
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answered by Scooter 4
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Whichever animal God created first.
2006-06-30 09:49:24
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answer #8
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answered by Anonymous
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Did all animimals get lungs at the same time ???????????? Just guessing!
2006-06-30 09:53:29
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answer #9
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answered by Horse Woman 1
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Frogs.
2006-06-30 12:18:46
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answer #10
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answered by Big Mak 3
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