what structures provide evidence that the frog has a partially aquatic life?
541895
Their skin. It is permeable to oxygen and carbon dioxide, as well as to water. On land, adult frogs use their lungs to breathe. When a frog is underwater, oxygen is transmitted through the skin directly into the bloodstream. Because the oxygen is dissolved in an aqueous film on the skin and passes from there to the blood, the skin must remain moist at all times.
549065
"Learn all sorts of true, weird and wacky facts about frogs and toads!"\nI've included the link for Poisonous frogs
682854
I'd never heard of grassfrogs, but I've done some reading about them.\nThis site:\nhttp://www.goldlinksweb.com/growlinggrassfrog/aboutfrog.html\nis a good resource for learning about them.  It doesn't say anything about tadpoles flying, but it does say that grassfrogs can travel over a long distance with no water.\nIt also says that the grassfrogs are rare, a protected species in Victoria, as a matter of fact.\n\nAnother site:\nhttp://www.studiocinqo.com/p_veenvliet/2_5_midwintertadpoles.htm\nmentions that though many grassfrogs hatched there aren't many tadpoles around.  He says that predators have eaten the tadpoles.  That might be your answer.\n\nHere's what another site said.  It again says that this is a threatened species.  \nThreats \nChytridiomycosis is an emerging infectious disease of frogs skin caused by the chytrid fungus, Batrachochytrium dendrobatidis and has been linked with continuing amphibian population declines in the western USA, Central America, Europe, Africa, and Australia. Ongoing studies suggest a correlation between resistance to lethal infection by B. dendrobatidis and synthesis (production) of antimicrobial peptides by the host amphibian. Further research is needed to define better the role of antimicrobial peptides in protection of amphibian populations and the effect of environmental factors upon antimicrobial peptide synthesis (Rollins-Smith & Conlon 2005). \n\nPhysical and environmental impacts include direct loss of habitat through removal of aquatic and riparian vegetation particularly by allowing grazing to the water edge. Draining of wetlands, lowing of freshwater groundwater through pumping and increased salinity from run-off and altered hydrological systems can all alter Growling Grass Frog habitat. \n\nPredator species such as the introduced Mosquito Fish Gambusia affinis can impact on tadpoles, Mosquito Fish are prolific breeders producing off spring three or four times per year. They can tolerate poor water quality and can inhabit waters otherwise unsuitable to many of the native freshwater fishes, which increases their capacity to prey on tadpoles. \n\nElevated nitrate and phosphate concentrations have been identified as a impact. Historical and experimental evidence suggests that in New South Wales the decline of Green and Golden Bell Frog L. aurea in its former range was due to high nutrient run off events. Fertilizers may also increase the nutrient status of waterbodies and thereby initiate eutrophication, resulting in lowered dissolved oxygen levels that do not support tadpoles (Hamer et al 2004). \n\n\nhttp://bird.net.au/bird/index.php?title=Growling_Grass_Frog\nCan the frogs be moved somehow?  Discouraged with sounds?  I don't really know the answer, but I hope these sites will help you.  You could also call the natural resources organization in your area. They might have some good ideas for you.
513168
Birds, Definitely. birds, being warm blooded, are much closer to mammals than amphibians. Amphibians only show the faintest glimmer of an R-Complex, known in your brain as a cerebellum - the reptilian part of the brain. Birds, by contrast, have a highly developed R-complex and even show the beginnings of a cerebrum (the big lumpy part of your brain that handles all that rational though stuff). Can you imagine a frog or a salamander uttering, "Polly wants a cracker?" >:)
616055
This threatened salamander is primarily fossorial (lives underground) as adults.  They feed on a variety of soft-bodied invertebrates. Small worms, beetle larvae, termites and the like comprise most of this salamander’s diet. Occasional forays on the surface may occur during periods of rain, affording the salamander an opportunity to seek prey on the surface or move to a new burrow location.
1004465
the first 1 would be frogs and the 2nd one would be lizards.....simple!!\nP.S.:thanks for the 2 points!
407668
They have mouth openings often with flagellum to help with their filter feeding.  The tail end is thinner and is lighter in color/more transparent.  Just do an image search for amphioxus and see!
996498
frogs like to swim in the water and are more aquatic than terrestrial, but they have very well developed meaty leg muscles, (both the calf and the thighs) and many muscles the same as humans which they can use for hopping too. They just use their hind legs for hopping though.  Those puny little arms-hands-muscles are not used for much other than propping themselves up when sitting, or a male may squeeze a female when he is on her back mating with her.
23787
There is a family of frogs, the Pipidae (the Surinam frog genus Pipa, and the African clawed frog genus Xenopus) that lack a tongue. They are entirely aquatic and Xenopus is often sold as an aquarium pet.
291772
Yes it is. It has a backbone and internal skeleton (characteristics of vertebrates).  Plus it is a reptile..and all reptiles are vertebrates.
855593
I would look here for your answer and/or a link that could get you your answer http://en.wikipedia.org/wiki/Vertebrate\n\nGood Luck!!!
801204
Kangaroos have a way of internally recycling their urine to conserve water, the urine they pass can be very concentrated. \nThere are a couple of types of frogs that survive underground for several years during drought. When it does rain, they come out, have babies, then have a very big drink, bloat up, go back into hibernation until the next wet season. They're called, aptly, the Water Holding Frog\nHere's a link:\nhttp://frogsaustralia.net.au/frogs/display.cfm?frog_id=127
187973
Mmm... it could have been an escaped pet. You could try to contact your local faunal control service and let them know, I'm sure environmental agencies would be interested in knowing about any possible exotic species. \nOne popular pet tree frog is Agalychnis callidrias (originally from Central America). Did it look like this?\nhttp://www.froggyville.com/images/graphics/usenet/wild28%5B2%5D.gif
242069
You could have found good answers to this either in your textbook or by a little web searching. \nOh, well...\nThe eggs of frogs have little vitellum, i.e, they're oligolecithal. This means that the entire first cell (zygote) will cleave to originate the individual. It undergoes the usual phases: blastula, gastrula and neurula. \nSee more at the links:\nhttp://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/FrogEmbryology.html\nhttp://www.uoguelph.ca/zoology/devobio/dbindex.htm\nhttp://embryology.med.unsw.edu.au/OtherEmb/frog1.htm#Frog%20Life%20Cycle
7930
Toads and frogs are BOTH amphibians.  Frogs have more permeable skin so lose more water through their skin and need a wetter environment.  Toads have dryer, wartier skin and are generally darker in color. Frogs lay eggs in clusters on water, toads lay eggs in strings. Frogs jump farther and have longer legs, toads hop. Frogs have tiny teeth, toads do not have teeth.
605539
http://en.wikipedia.org/wiki/Frogs
1186677
1. amphibians don't have AMNIOTE land egg. Reptiles do.Thus amphibians lay LOTS of eggs which have HIGH mortality rates from fungus, other organisms eating them; reptiles eggs are less vulnerable to mortality and so they lay fewer and have higher rate of hatching\n2. amphibians mate with external fertilization. Reptiles have internal fertilization and mate with HEMIPENES, not penis (true penis is in mammals!)\n3. slimy skin in amphibians, so they need water env, vs reptiles have heat-dessication resistant scales\n4. Most nitrogenous wastes of amphibians are ammonia\nreptiles have very concentrated uric acid\n5. amphibians and most reptiles have 3 chambered heart, but CROCODILIANS have a partial septum in their ventricle\n6. metamorphosis in amphibians, dev in egg in reptiles\n7. reptilian skull much more solid-heavy than amphibians.  There are more bones in reptiles (radio-ulna is ONE bone in frog, tibio-fibula is ONE bone in frog.  Reptiles have the same lower leg-arm bones as us humans and are NOT fused as in amphibians. Amphibians lack ribs, reptiles with ribs.\n8. ear HOLE and external ear on reptile head. Amphibians just have the tympanic membrane there,so they don't have much of an external ear.