To understand an organism, it is crucial to understand its levels of organization. The first level is the cellular, in which we analyze the cell, that is, the functional and structural unit of living beings. The next level is the fabric; then the organs; then the systems, and finally the organism as a whole. The image shown in the above question demonstrates the levels of organization, and image 4 represents the tissues.
Tissues are structures formed by a set consisting of similar cells acting to perform the same function, and by the extracellular matrix. They are not found in isolation in our bodies, but are always associated with each other, forming organs and systems.
