N the diagram below, images 1 and 2 represent the chemical and molecular levels

N the diagram below, images 1 and 2 represent the chemical and molecular levels of organization. Based on the levels of organization, what does image 4 represent? A diagram with 7 parts. 1, An atomic model. 2, A molecule. 3, A small group of cells. 4, A group of cells creating layers. 5, The heart. 6, The circulatory system. 7, A cat.

tissue
cell
organ system
organ