All organisms must create a nitrogenous waste. In birds the waste is in the form of Urie acid in sponges it diffuses out of the body in humans it is urea and in flatworms it is ammonia. This shows what concept

Wow thats alot but it would be the 3 one

Like many students at university, you may be unhappy about the results you attain in exams. you may feel that even with all you are doing there must be something more -- or different-- you could be doing to get better grades. we have all at some time or other heard of that student who only studies a couple of hours for final exams and scores a's every time. we stand in awe of those who seem to breeze through without undue effort and seem to need very little in the way of studying to nail an exam. the reasons for success, in what i think are the vast majority of cases, are less esoteric than many students think: successful students consistently apply a series of productive strategies with view to attaining clearly identified learning and grade goals throughout the academic term.

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Overwritten or erased text files e-mails because since they are overwritten or erased they do not appear in an exam of the rom. in the rom you can find easily email that is not being erased or rewritten, as they are stored in memory, but if they are erased or overwritten those records cannot be accessed in a second moment.