Excretion in Planaria

In planaria, Co2, and water are major waste products. In planaria long tube like structures are excretory organs. These tubes have bulb like structures and have long cilia project in them and they form flame

cell system. The cilia create continuous currents within the flame cell system and current carry fluid and waste products out of the body through pores.

Why is it better to prepare for the Unified State Exam in Social Studies in groups? It is impossible to underestimate the importance of preparing for the social studies exam. Without competent preparation, you can fail testing, and also put an end to your entire future career, given the education system of the  Federation. This applies to all exams, especially if the Unified State Exam becomes an admission ticket to a prestigious university.