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Because of buoyancy. Buoyancy is a force caused by fluid pressure. Buoyancy can cancel out gravity, so that an animal living in the water does not even need limbs to support its body weight. Dolphins and whales, for example do not need any limbs. They have turned their front limbs into flippers and their rear limbs have almost disappeared entirely.
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∙ 7y ago
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∙ 14y agoOrganisms on the land need to support themselves, so a stronger skeletal structure is necessary. Organisms in the water are very much supported by the water surrounding them, so a weaker skeletal structure is only necessary to keep the body together.
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∙ 14y agoBecause the water provides the support instead of the spine
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∙ 12y agobecause if you put a land animal on water than it wouldn't float cause of it's body mass
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∙ 12y agobecause there body weight is support by the water
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∙ 11y agoAwais Ansar
- Because gravity on land is heavier than in water
Anonymous
Because gravity on land is heavier than in water
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What is the difference between terrestrial biome and aquatic biome?
Differences between Terrestrial and Aquatic systemsbecause aquatic environments are so rich in nutrients they support more live than equivalent terrestrial ecosystems. The small drifting photosynthetic organisms of the oceans, referred to collectively as phytoplankton are regarded as the major photosynthesizers, or primary producers, of the earth,aquatic environments are much more stable than terrestrial environments, with smaller fluctuations in temperature and other variables,aquatic organisms are seldom exposed to desiccationwhile terrestrial organisms are often exposed to desiccation and are usually relatively resistant to drying out,oxygen (because there is very much less present) is sometimes a limiting factor an aquatic habitats but this is seldom the case in terrestrial habitats,light can be a limiting factor in some aquatic habitats, but in most terrestrial environments there is hardly ever a a shortage of light,terrestrial animals are influenced far more by gravity, while water supports aquatic organisms.
What happens to aquatic organisms when the water is to warm?
There are many answers to this question. Warm water contains less oxygen so some aquatic organisms that get their oxygen directly from the water may not be able to survive, other organisms may grow rapidly in higher temperatures. This overgrowth could further deplete the available oxygen creating additional losses. If the temperature is high enough animals that didn't succumb to low oxygen levels may die of metabolic problems.
Why are there less animal habitats?
A lot of animals are disappearing because they are going extinct. Most of the disappearing is because of hunters. Another reason is because people are cutting down their habitats. The last reason is that predator's are eating them
What aquatic ecosystem contains the least amount of saltwater?
The absolute least amount salt would be freshwater, but brackish water - usually being a combination of seawater and freshwater - contains less salt than seawater.
What are the Physical and biological factors affecting the solubility of dissolved gases in aquatic ecosystems?
Physical factors are temperature of the water (higher temperature, less oxygen dissolved), salinity and altitude/pressure. I'm still looking for the biological factors.
Why breathing rate of aquatic organisms is faster than the terrestrial animals?
The breathing rate of aquatic animals is faster than that of terrestrial animals because the amount of dissolved oxygen in the water in much less than the amount outside, so they have to breathe more in order to get more oxygen
Why animals living in the water breath faster as compared to land animals?
because there are less amount of dissolved oxygen in water so that aquatic animals breathe more faster in order to get more oxygen.
Why are aquatic animals such as whales larger than terrestrial animals?
The breathing rate of aquatic animals is faster than that of terrestrial animals because the amount of dissolved oxygen in the water in much less than the amount outside, so they have to breathe more in order to get more oxygen
Does oil make an animal sink?
If by "oil" you mean petroleum (as opposed to olive oil) then YES, petroleum makes many animals, especially aquatic birds (like penguins and ducks) sink. The reason for this is that the petroleum sticks to their feathers giving them less maneuverability. As concerns aquatic mammals and fishes, the petroleum gets into their skin/scales and makes them less buoyant.
What things have a skeletal system?
less than the things that dont
Do 100 bones make up the skeletal system?
i think no because we have 206 bones in are body so we can't have less bones in are skeletal system we cant have less than 206 bones
What is the effect of environmental pollution and air pollution?
*It causes many diseases like Asthmas lungs cancer etc*By water pollution water will become very impure & it effects the life of aquatic animals & many aquatic animals will die also.*It effects the growth & development of plants
What are the small organisms and large organisms?
Small sized animals need less food as compared to large sized animals. A field of plants can support more numbers of small animals as compared to large sized animals which need more food, it is why smaller animals are numerous .
Why is radial symmetry is found among aquatic species rather than animals that live on land?
All life on land evolved from a few aquatic ancestors. It just so happens that all of these ancestors were not radially symmetrical, so all land animals are not radially symmetrical.
How does ice protect aquatic animals?
Ice protects aquatic animals by isolating (ice is a good thermic isolater) the bottom of the pond from the atmosphere, and preventing the bottom of the pond from freezing and becoming ice.beause they are used to water
What are animals called that have no mouth?
Mouth-less animals.
What are some disadvantages of animals being in World War 1?
because the animals would die! :( poor animals! also if they had less animals it would mean less meat and less advantage! i answered this cos i am awesome
