Answers

2015-08-10T22:03:50+05:30
Bcoz they dont hav any specialised organ to carry out the process of diffusion ..so they respire through the process of diffusion
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2015-08-11T14:34:15+05:30
1st thing that is unicellular a singles cell organism so obviously they respire through diffusion they are very small and they having no any another cells and parts to take another option as like human  .
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