Nitrogenous Waste Removed from Body

Simple aquatic animals excrete ammonia in surrounding water by diffusion. In higher animals ammonia is converted into less toxic compounds such as urea, and uric acid.

Urea is excreted out in the form of urine. Uric Acid is produced in insects, reptiles and birds. It is excreted out in the form of crystals with little water..

How many people are involved in small groups? Sociologists have determined the optimal number of graduates in preparatory mini-groups, and it ranges from 3 to 6 people. The completion of tasks for the participants is distributed in pairs or triplets. So, the teacher is a participant in the process, and not just a controller. How effective is group training? Half of the success in preparing for the exam is attributed to comfort during classes. The student finds himself in a society of like-minded people united by a common goal. Often, group social studies develop into a competition, where the participants wish to complete the task faster and better than their competitors.