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Which of the following ways make tardigrades unique among the panarthropods? a) use of diffusion only...

Which of the following ways make tardigrades unique among the panarthropods?

a) use of diffusion only for gas exchange

b) parthenogensis as well as sexual reproduction

c) a CNS comprised by paired segmental ganglia

d) use of Malpighian tubules for urine production

e) none of the above are unique

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Answer #1

Use of diffusion only for gas exchange

In case of the tardigrades, they use only the process of diffusion which helps in exchanging the gas but when it comes to the arthropods, they have system of tiny tubes on the body which help to exchange gas with the surrounding environment. These tubes are known as trachea. In tardigrades, the urine formation takes place with help of a structure that is close to rectum and resembles Malphigian tubes but not exactly the same. Both of them are able to undergo both parthenogenesis and sexual reproduction. Parthogenesis is where an organism has both male and female part. The CNS generally has trilateral segmentation in tardigrades

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