I need to do a report on an animal from the mesozoic era and I was wondering if anyone had good info about pufferfish back then :)
126578
The earliest known pufferfish (Family Tetraodontidae) is from the lower Eocene, about 55 million years ago.  There are no known specimens of this family from Mesozoic aged strata.
216903
Perhaps... the weather during the early part of the Cretaceous was warmer than today (and more uniform.)  I'm actually in the process of writing a paper exploring the possibility of hadrosaur hibernation in northern Alaska.\n\nI took a tour of a dinosaur resource center today.  The tour guide said that ability to adapt is what saved KT survivors.  Crocodiles can go months without eating.  Birds migrate.  Fish could swim to deeper water.\n\nIt is still highly debated to what caused the Cretaceous Tertiary extinction.
352272
I searched the ultimate source of all the stuff on net and here's what came out-\n\nhttp://scholar.google.com/scholar?q=humans%20and%20shark%20dna&hl=en&lr=&oi=scholart\nhttp://www.google.com/search?hl=en&q=humans+and+shark+dna\n\nGood luck
127043
Birds are the direct descendents of dinosaurs.  Many scientists will say they *are* dinosaurs.  As such, they are alive, so dinosaurs are alive.\n\nWhile it remains possible that some dinosaurs proper have survived, it is extremely unlikely at this point.  There is no physical evidence for it.\n\nYour second question is difficult to answer.  Are there prehistoric creatures that have survived?  Sure!  Pretty much every species on earth today (even humans!) is older than history, that makes it prehistoric!  Defining prehistoric any other way would essentially make prehistoric mean "not surviving today", so the answer would be no.\n\nWhat you mean, of course, is creatures to have survived from truly ancient times, such as from the Mesozoic (age of dinosaurs) or older, but again, it's difficult to answer.  There probably aren't any actual species that old, but it's difficult to tell if something in the fossil record is actually the same species as something alive today.  Consider, lions and tigers look and act very different alive and are certainly two different species, but it is very difficult to tell their skeletons apart.\n\nA lot of so-called "living fossils" really aren't.  For instance, we have no fossils of the Coelacanth.  It's closest relatives in the fossil record are in another family (as different as cats and dogs).  Cockroaches are often said to have been unchanged for millions of years, but it's not the case as the fossil record records them evolving continuously.  The first fossil cockroaches had three pairs of wings!\n\nBut some things have survived nearly unchanged for millions of years.  Six-gill and Port Jackson sharks are very much like they were in the age of dinosaurs.  The Tuatara is surprisingly like it's Mesozoic relatives.\n\nBut the king of living fossils is the Lingula brachiopod.  It looks like a clam and lives by filter feeding, but don't let it's calm appearance fool you.  These little guys are survivors.  They've been living in Earth's oceans almost unchanged for 550 million years!  That's almost as long as we have animal fossils at all!  Dinosaurs are hardly teenagers by comparison!\n\nAddenda:  The Komodo Dragon is NOT believed to be a dinosaur, at least not by scientists.  It is just a large monitor lizard.  Dinosaurs are not lizards, being classed among the Archosaurs with the crocodiles, pterosaurs and birds.
625067
The most famous example is the dodo, but my personal favorite is the tasmanian tiger, as it's decline was well documented. The great auk is another, as well as the stellar sea cow, carolina passenger pigeon, and the moa. If you look any of these up on www.wikipedia.com they will direct you to some links at the bottom of the article, but your best bet would be to look them up on amazon.com, go to the library, and get some books on them. Best of luck
210247
I did a search for you:\nhttp://www.ask.com/web?q=sea%20wasp%20jellyfish
281339
http://en.wikipedia.org/wiki/Brachiosaurus
151468
I know you're probably needing a more direct answer, but there are _loads_ of information on polyandrous animals. Try using Google Scholar for serious scientific papers:\nhttp://scholar.google.com/scholar?hl=en&lr=&q=polyandry+evolution
461832
There's not much on the internet. Here's the best of what I found.\n\nhttp://www.trivia-library.com/c/extinct-ancient-societies-tierra-del-fuegians.htm\nhttp://www.britannica.com/eb/article-9082335/Chono\nhttp://www.cs.org/publications/CSQ/csq-article.cfm?id=721
145179
There are two theories to explain how the Platypus has evolved into what it is today. The first (theory B) shows that relatives of monotremes formed their own evolutionary branch that was completely different from development of both marsupials and placentals. This change is thought to have occurred 135 million years go, the beginning of the Cretaceous period. The marsupials and the placentals divided at some point 135-65 million years ago.\n\nThe Second (theory A) was proposed by Gregory (1947) and was not popular until the 1970s. He said that between 135-65 million years ago, the placentals and marsupials separated to their own way then later the monotremes and the marsupials went their own way.\n\nEvidence for this theory is that the reproductive systems of monotremes and marsupials are extremely similar. The embryos of both have some stage of encased shells in the gestation period. The only difference is that monotremes have the encased shells throughout the entire gestation period, whereas marsupials only have the encased shells for about two thirds of the gestation period.\n\nAre you denying that evolution exists at all?
48381
Read the information on these sites and maybe you will find some of the answers to your questions.\n\nhttp://www.answers.com/echinoderm%20\nhttp://www.answers.com/topic/tube-foot?hl=echinoderm\nhttp://www.answers.com/Aristotle%E2%80%99s%20Lantern\nhttp://www.answers.com/main/ntquery?method=4&dsid=2222&dekey=Sea+urchin&gwp=8&curtab=2222_1&linktext=sea%20urchins
607286
I was able to find a black marlin @ 1560 Lbs caught in Peru  and a Greenland shark caught in Norway that weighed in at 1708lbs 9oz!  I didn't find any pics but if anyone has them I would like to see them.
10716
Here is a great website for that sort of research. It has a taxonomic chart with hyperlinks to information, pictures, sounds, and specimens. There are more than a dozen phylums of 'worms' represented with many photos to help with identification. \n\nhttp://animaldiversity.ummz.umich.edu/site/accounts/classification/Animalia.html
472565
You can eat any animal in the whole wide world. Unless their meat is deadly. isn't a puffer fish deadly?? I can't remember.
606563
I think they were killed in the flood, but have you ever read (I think) in Job about the leviathan?  Sounds so much like a brontesaurus or dipladucas doesn't it?  People try to say it's a croc, but it's  nothing like a crocodile.  Also Psalms 74 says He lopped off the heads (plural) of leviathan, and made mincemeat of the dragon.  I'm not trying to make people believe anything, it's just one of the things I wonder.
446784
Pre-Cambrian life was mostly soft-bodied -- there were very few if any creatures with bones, skeletons, or hard shells, so there were very few fossils left.\n\nBesides, it was a long, long time ago -- and geological activity on the earth (volcanic action, subduction of continental plates, erosion, etc.) have wiped out a lof of what was the surface of the earth then. :)
314625
try www.bbc.co.uk.  Although, I would suggest going to your library and borrowing their copy of the movie Walking with Dinosaurs or Allosaurus.  It took me almost a year to convince my 4 year old that dinosaurs no longer live after she saw them.