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i think that, because they're so small, they only rely on a network of trachea, tracheoles and spiracles to supply oxygen - as their small bodies provide a short difusion pathway.

i think

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Q: Why do small worms not need gills to obtain sufficient oxygen?
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How do amphibians obtain a supply of oxygen for respiration?

Either through their lungs as adults, Gills as larvae, and small amounts of oxygen through their moist skin.


How do dragonflies obtain oxygen?

Since,dragon fly nymph is in water once it has hatched from its egg it will breathe through gills.


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Why do smaller annelid worms not need gills to obtain sufficient oxygen?

I got this question in a biology past paper and tried to find the answer on the internet too, so i thought i best answer it for other people :P i settled with the species are so small that they have a large surface area to volume ratio, meaning they take in quite a lot of oxygen, and because they're so small they don't use up all of this oxygen as quickly as lugworms and other larger species of annelids. if it's wrong, sorry, i basically just took knowledge and made a logical guess


Do sharks need air like humans?

yes, sharks take small oxygen bubles and breath them through there gills


Do sea horses breathe?

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How do crabs breathe?

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What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?

Fish, or animals with gills must absorb oxygen from sea water which has a low available oxygen level, particularly warm sea water so they must move great amounts of water through their gills in order to get enough to survive. Sea mammals must always surface in order to get a breath and their diving depth and time is limited by this. Land mammals have more than enough available oxygen in the air to support life. To emphasize, air has a much higher concentration of oxygen when compared to water under the same conditions. Air is about 21% oxygen (1) whereas water is about 1% oxygen (1). It is interesting to see how different animals obtain their oxygen. Small insects have pores that allow oxygen to directly diffuse into their tissues, thus ridding the necessity of a complex circulatory system. 1.http://lakeaccess.org/russ/oxygen.htm


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Does prawn breathe with their lungs?

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Do bettas have gills?

Bettas and other members of the anabantoid family of fish, which includes the gouramis, paradise fish, snakeheads and combtails, all have adapted to life in stagnant, oxygen depleted ponds and pools. In many instances, they cannot get enough oxygen using their gills alone. They have therefore developed an organ called the labyrinth organ, a long, coiling airway that enables fish from this family to breate atmospheric oxygen, thus reducing their dependance on the oxygen held in the water. In many fish of this family, their dependance upon atmoshpheric air is so great that one can if it is prevented from reaching the surface.