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WebMar 3, 2024 · GASEOUS EXCHANGE AND RESPIRATION. Gaseous exchange is the movement of oxygen and carbon dioxide between the organism and its environment at the respiratory surfaces. Oxygen goes in and carbon oxide goes out – These gases move in and out through diffusion. Respiratory surfaces – These are surfaces on which gaseous … WebNov 20, 2015 · As Biology Notes. of 49. 1.1.1 In small unicellular organisms, substances move around slowly by diffusion. Diffusion is too slow to move substances round the larger bodies of multicellular organisms. They have a circulatory system: substances are carried in blood pumped by a heart. In a closed circulatory system (eg in vertebrates) blood is ... WebMar 27, 2024 · biology, study of living things and their vital processes. The field deals with all the physicochemical aspects of life. The modern tendency toward cross-disciplinary research and the unification of scientific … smaller prawn crossword