Reflect, using common situations as example, on the functions of the organ systems in your daily activities. Ask questions to students, such as how the different systems in animals have evolved? What are the main characteristics of the different systems? What are the differences and similarities of the systems in vertebrate and invertebrate animals? What are the similarities of the structures of the systems in aquatic and terrestrial individuals? Carry out all the suggested activities so that students can better understand the topic of this learning object.