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Maria talks about the structure of the human respiratory system: nasal cavity, nasopharynx, larynx, trachea, bronchi, etc. This topic is found in the CT and the Unified State Exam in biology, so watch carefully. Look for tests for video lessons here https://adukar.by/courses/biologiya Sign up for our courses https://bit.ly/2InQP8G +20 points to the CT 2019 in the final biology lesson: https://bit.ly/2XnORLL Join our group, where we prepare for the CT in biology https://vk.com/biologiyact Solve the CT online in biology https://bit.ly/2QJ27bq Read all the education news here https://adukar.by You will find a lot of useful things in the Adukar group https://vk.com/adukar