Is there any difference in a marine animal to aquatic animal? Please explain why.?
85097
I do not beleive their is a differance between Aquatic or Marine animals.
176452
Plankton are plants and animals that drift the oceans according to the currents. Animals in this class include\n\n* Amphipod\n* Copepod\n* Jellyfish\n* Salp\n* Polychaetes\n* Arrow worms\n\nThese animals are called holoplankton because they spend all of their lifes depending on the current. There are are also meroplankton which only spend the larval period as plankton. These include the larvae of sea urchins, starfish, crustaceans, marine worms, and most fish
105990
Dolphins do live in freshwater, but you can't take a dolphin that lives in salt water and put them in a freshwater environment. \n\nHere are some dolphins that live in freshwater.\nBoto http://en.wikipedia.org/wiki/Boto\nChinese River Dolphin http://en.wikipedia.org/wiki/Chinese_River_Dolphin\nGanges and Indus River Dolphin http://en.wikipedia.org/wiki/Ganges_and_Indus_River_Dolphin\n\n\nPlaces like SeaWorld have salt water tanks--
1071274
You have fish in inverted commas, does that mean you are unsure?  Did it have eyes, a mouth, gills?  Was it a vertebrate? The first thing I thought of was a sea slug or flatworm.  A sea slug seems more likely in a Carribean coral reef.
514779
it all has to do with pressure, the internal pressure of a fish matches the pressure of the surrounding sea, in other words, they are of equal pressures, more or less
1029124
Fauna are  living animal organisms, characterized by voluntary movement.\nFlora are living plant organisms, lacking the power of locomotion.
575768
No oceans are made of freshwater, unless I am mistaken. They are all made of salt water.
397202
What is the difference between a dolphin and a porpoise? I heard this question asked, on Johnny Carson. And, Johnny decided that a dolphin was a mammal, and a porpoise was a fish. Wrong. They are both mammals, and are very closely related. The porpoises have a rounded head, while the dolphins have a protruding snout. They are smaller members of the toothed whale family, to which killer whales and sperm whales belong.\n\nTo complicate things, there are a couple of fish which are also called dolphins. I assume that these are sometimes called "dolphin fish" to avoid confusion. But, the well-known dolphins are those cute mammals, like Flipper (who is a bottle-nosed dolphin).\n\nMammals have hair, breath air, give birth to live babies (platypuses and echidnas lay eggs), and feed milk to their young. Whales breath air (they can hold their breaths for long times), give birth to live babies, and feed milk to their young. Where is their hair? Evidently, they have a small amount of hair around their blow-holes, those holes, in the top of their heads, that they breath through.\n\nThe toothed whales are among the most intelligent of all animals. The killer whale (orca) apparently has a brain mass to body mass ratio (a rough measure of intelligence) which is greater than that of humans. Incidentally, while toothed whales are predators, there is no record of any killer whale ever having killed a human being.
897506
Terrestrial tetrapods have no spiral valve, more veination, large intestines, while fish may have spiral valves and no large intestines.
195288
There is a flaw to the wording of your question, technically, yes Mammal's burn more calories than reptiles due to higher metabolic requirements, however, their efficiency at burning calories is the same-- the flaw is in your wording.\n\nFor instance, all car engines have the same efficiency for burning fuel ;) The difference in car engines is how well they utilize the energy harnassed from burning the fuel. If you were to compare the bodies of reptiles and mammals to car engines, then a mammal would have a gas guzzling engine that goes very fast but for only short trips, whereas a reptile would have a much more optimized engine for longer endurance and low fuel usage.
951836
All cells have cell membranes.  They both have DNA and a lot of other stuff common to all life forms.  The main difference is that animal cells don't have cell walls but plant cells do.  If I were God, I would make animal bone cells have cell walls.  That would be cool.
525455
If snakes evolved from land dwelling creatures, then those land dwelling creatures evolved from sea creatures.  After all, humans evolved on land.
228732
Interesting question, but I think you're putting the cart before the horse. \nI could say that they don't live out of the water because their many specializations make it impossible; you've seen what happens when a whale gets beached. \n\nAnd why not turn the question around? Why not ask\n"If dolphins live in the water, why do they have lungs instead of gills?"\nThe thing is, adaptation is a phenomenon that usually shows us amazing results, such as the entire lifestyle of cetaceans (and they have many specializations for aquatic life). But a specialized or well-adapted animal is not "perfectly" fitted, because of the way evolutionary processes work. \nEvolution and natural selection can only work on the "materials" that are already there; and the lungs of mammals are not something that can be "reverted" to gills; their origin goes way back to remote ancestors of the whales. This irreversibility of _complex_ evolutionary processes is known as Dollo's "law" (and creationists love to misinterpret it). Stephen J. Gould gave a good example with the giant panda's "thumb" (this additional finger arose from one of the bones of the carp (wrist), and the real thumb of pandas is as reduced as in the rest of the Carnivora). \nEven if cetaceans where to evolve back into terrestrial animals, the results would not look like their ancestors, or probably anything that we know.
339816
Both of them are important.They have various habitats,ecosystem etc but that doesnt mean one is more important than the other.Extinction of a single species can lead to imbalance in the food chain and other species may start dying as a result.\n\nSo every living creature is important in the ecosystem.
237825
um....there are a lot of them.\none example is the snake.  It is a mammal, and it's warm-blooded, and it doesn't have legs.  The fish family do not have legs and they aren't mammals and they're cold-blooded. If you're looking up a certain animal, just identify some of its characteristics and try to make sense out of it.
399502
The difference between any organism's freshwater and marine counterparts are in homoestatic fluid balance.\n\nA marine hydra has a problem with maintaining enough water in its body. The salt concentration outside the hydra leads to diffusion of water outward. The hydra has to actively either take in water or remove salt (it does both).\n\nFreshwater hydra have a problem with having too much water in its body. Because there is more salt in the hydra than outside, water diffuses into the hydra. To maintain balance, the freshwater hydra actively transports water out of its cells.\n\nMany of these same issues can be said of freshwater fish and ocean fish, too.
976863
You are quite right, similar contraditiction comes up when you compare monkeys with fish, and fish, fish with worms and worms with bacteria.\n\nBetter yet, compare a St.Bernard with  a Toy Terrier - one is 10 times larger than another, no way they could have evolved from a common ancestor.