Ключевые слова: abstract, air, anatomy, background, biology, branch, breathe, bronchial, cancer, care, cleared, concept, conservation, design, earth, eco, ecology, ecosystem, environment, environmental, flower, forest, garden, grass, green, growth, health, healthy, human, idea, illustration, internal, leaf, life, lung, nature, organ, oxygen, plant, pollution, protection, respiratory, save, shape, sky, symbol, system, tobacco, tree, white,