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This is because of the surface to volume ratio. A small mammal has a larger surface area, as compared to its volume, than a large mammal does, so a small mammal's surface area to volume ratio is bigger. A large surface to volume ratio causes things to pass into the organism and out of the organism more easily, so a mammal with a large surface to volume ratio (a small mammal) will lose heat more easily in a cold environment than a mammal with a small surface to volume ratio (a large mammal).
What else can I help you with?
Why do smaller animals have a higher metabolism compared to larger animals?
Smaller animals have a higher metabolism compared to larger animals because they have a higher surface area-to-volume ratio, which means they lose heat more quickly and need to generate more energy to maintain their body temperature.
How would you describe the relationship between surface area, volume, and body size in animals?
The relationship between surface area, volume, and body size in animals is that as an animal's body size increases, its volume increases faster than its surface area. This means that larger animals have a smaller surface area relative to their volume compared to smaller animals. This has implications for things like heat regulation, as larger animals may have a harder time dissipating heat due to their smaller surface area relative to their volume.
Why small homeothermic animals like hummingbird restrict to warm climate only?
Smaller animals, like hummingbirds, can't keep their body temperature warm as larger animals because they are so small.
How does the size of an animal affect the breathing rate?
Smaller animals have a higher rate of respiration because they have a higher metabolism. Smaller animals have a higher metabolism than larger animals as a rule because the surface area increases as the square of the radius while volume increase 3rd power of the radius which means that smaller animals need to generate more heat because their heat loss is greater for their mass. A higher metabolism requires more oxygen and a higher rate of respiration.
Why animals liver are bigger than human liver?
Not all animals livers are bigger (compared to body weight) than humans. However, some animals' livers are a larger proportion of the body weight because those animals are carnivores (unlike humans which are omnivores). A possible reason for this is that carnivores must be prepared for large, infrequent meals - so their liver needs to be large to deal with a sudden large intake of fat. Other animals, such as horses and cows, have larger livers simply because they are a much larger animal than a human (and in fact their livers are smaller relative to body weight).
Does a mouse's heart beat slower than an elephant's heart?
Yes. There is a direct correlation between an animals average body size and the speed of its heartbeat with smaller animals having faster heartbeats than larger animals.
What is the term for a body of water larger then a lake and smaller then an ocean with salt water?
A Sea.
Why smaller mammals often have a higher respiration rate than larger mammals?
Smaller mammals have a higher respiration rate than larger mammals because they have a higher metabolic rate relative to their body size. This is necessary to support their energy needs, as they lose heat more quickly due to their higher surface area to volume ratio.
What is it called a smaller stream that runs into a larger river?
A stream smaller than a river is known as a creek
Why do polar animals have smaller noses and ears than animals in warmer climate?
to stay warm/retain body heat.
When the body requires larger and larger doses of a drug to experience the same effect that a smaller dose once produced is?
Drug tolerant
How the decrease in in body surface area to volume ratio in larger animals on respiratory systems in the evolutionary process of animals?
rapping
