an ectothermic vertebrate whose body temperature is controlled externally, what animal is it?
359291
Not most fish, all fish.
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?" >:)
23198
the deeper down you go the less the temperature changes.  they just get deep enough where they can survive, or at least where their eggs can survive
299118
because of all the energy that your muscles use, turns into 25% motion, and 75% heat. our body does that so we can be mammals. cold blooded animals convert 100% into motion, hence, they create no heat. however, we cannot bypass this mechinism because it is necisary for life.
788728
Yes. \n\nThe vast majority of paleontologists believe that anatotitan, like all dinosaurs, was warm-blooded. The definition of a warm-blooded creature is one which is able to regulate it's own body temperature.
1081876
Eptiles do not use water to flush nitrogenous wastes from the body as urine, like mammals do, but convert them to a form which can be dumped as solid dung.\n\nDiverse lizards of Oz\nNext to birds, lizards are among the most commonly encountered vertebrate animals in the savannas. Indeed, the diversity of lizards in the tropical savannas is particularly rich, exploiting numerous habitats, from woodlands to sandstone escarpments, rainforests and semi-arid zones, many endemic to just small areas.\n\nEvolution of lizards\nThe combination of poor soils and dry climate is believed to have led to the evolution of plants with tough, thick, chemical-laden leaves—and relatively few plant-eaters. Instead, the vegetation is broken down by termites, which thrive in Australia—providing an abundant food source for reptiles. Just as mangroves don’t need salt but have developed strategies for living where no other plants can compete, so too have reptiles exploited an environment largely uninhabitable for other animals.\n\nThe great diversity of reptile species may be due to the long-term stability, and great size, of the Australian continent. Those animals which cope well with conditions have had plenty of time to evolve into different species exploiting different ecological niches. This diversity may even be fostered by shortages. This may favour large numbers of specialist species which have adapted to localised conditions over fewer, more widely distributed, species which might have evolved in a more benign environment.\n\nEfficiency of lizards\nExcepting Antarctica, Australia is the driest continent on earth; 75 per cent of it is arid or semi-arid. The climate is erratic, with long, irregular dry and wet cycles determined by the effects of El Nino and La Nina. Successful animals must cope with unreliable rainfall and prolonged periods of shortages, but take advantage of unpredictable times of plenty. In addition, Australia’s soils are also nutrient-poor, with low productivity, and fires are frequent. Energy-efficiency is thus the key to long-term survival.\n\nMammals and birds generate their own heat from food, using up to 90 per cent of their energy intake for this purpose. However most lizards, instead of consuming food to generate energy, use solar power, basking in sunshine or sleeping in a warm spot to power up their ‘batteries’ for the day’s (or night’s) activities.\n\nSome lizards, such as dragons, are able to raise their ribs and angle their bodies to increase the body surface exposed and can become darker to absorb more heat. This strategy, known as thermoregulating, is not an option for some lizards which live in closed forests. Instead, they thermoregulate passively, or ‘thermoconform’, their body temperature simply conforming to that of the air around them.\n\nLizards are also efficient users of water. Their dry scaly skin reduces moisture loss, those living in the hottest areas tending to have compact bodies to minimise loss and/or restricting most activities to hours of darkness. In addition, reptiles do not use water to flush nitrogenous wastes from the body as urine, like mammals do, but convert them to a form which can be dumped as solid dung.\n\nGetting away from predators\nGeckos, legless lizards and skinks will readily drop their tails when threatened, the wriggling appendage serving as a distraction while the owner makes its getaway. Fracture planes between certain vertebrae at the top of the tail allow it to detach easily when pulled apart by special muscles. This sacrificial offering is easily regrown. Tails of dragons and goannas can also break off, but do not do so as readily and tend not to regrow. All dragons, goannas and Australian geckos lay eggs but some skinks give birth to live young. Experiments with skink eggs suggested that those kept at ‘maternal’ temperatures were larger and fitter than those kept at normal nest temperatures. This may be an important factor in cool, or dry, clima
318800
The mammals are the class of vertebrate animals characterized by the presence of mammary glands, which in females produce milk for the nourishment of young; the presence of hair or fur; and endothermic or "warm-blooded" bodies. The brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals encompass some 5,500 species, distributed in about 1,200 genera, 152 families and up to 46 orders, though this varies with the classification scheme.\n\nPhylogenetically, Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).
376409
It is a mollusk that can partly come out of its body. It has mouth and other feeding organs with the help of which it can feed.
343910
Probably externally, like lots of other fishes.  They male releases the sperm, and the female releases the egg.  The sperm drifts towards the egg, and then the egg is fertilized.
971153
Most mammals lower their body temperature by 1 to 2°C during sleep, resulting in a lowering of energy metabolism by about 7-15%.
832217
Most animals shed or grow fur/feathers in order to adapt to different temperatures.
784891
Excellent question!\n\nAnimals that are able to control salt concentrations in their bodies are called osmoregulators. Animals that cannot control internal salt concentrations are called osmoconformer.\n\nAn osmoregulator, they controls the amount of salt in its body. The fluids in its body contain salts, but are only about one-third as salty as the ocean around them. It is a constant battle for them to make sure their bodies do not get too salty. To do this, they drink a lot of sea water, keeping the water and getting rid of the salt through special cells in their GILLS.
129539
no because cold blooded animals are dependant of the  environment temperature \nif the temperature outside drops to 0 C you would die
981100
no, it wouldn't be easier.  Certain compounds have lower melting points than others.  Lipids for example, if you cool your body down too much become very rigid.  The resulting body temp is actually in a very important lipid range that deals with lipid and membrane fluidity.  Evolution to this is probably the result of species out competing those with lower internal temps.  Besides, our bodies naturally produce a very high amount of heat non-related to cell temperature regulation as a result of moving and living anyways.
832561
If you mean 'Iguana', then: lizard, cold blooded, grows by sheading skin
940121
Yes, but it is always changing and is usually quite close to that of the outside ambient temperature. Insects are what are called Poikilothermic or ectothermic animals, they are unable to maintain a contant body temperature through metabolism like mammals and birds can.\nSome insects however have found ways of controling the temperature of their bodies slightly. This occurs mostly with social insects. I wont get into too much detail here but insects like termites actually orient their mounds north-south to collect the warmth of the rising sun, these are the so called "magnetic" termites. Most other termites actually leave an opening in the top of the mound to allow heat to escape, this escaping hot air pulls in cool air surroundign the nest, and cools it down.\nBees will often use their wings to circulate air into the hive to cool down, and they will also become much more active when it is cold to warm up.\n\nhope this helps!
550793
With great difficulty. Penguins tend to huddle together to stay warm. Polar bears have black skin and hollow quill like fur that collects sun energy like a solar water heater. Nature has adapted many polar animals, and even Eskimos with unique abilities that are very individualized for survival.\nGreat question!