There are 3 different levels of body organization. Cells, Tissues, organs, and body systems. They are all separated from least to greatest based on their size. There are also 4 different kinds of tissues. Connective, Epithelial, Nervous, and Muscle tissue. All the different kinds of tissue do different, but important things. The connective tissue connects, supports, and separates. Your nevous tissue send electrical signals thorough your body. Next is the muscle tissue and that contracts and relaxes to produce movement. Lastly the epithelial tissue covers and protects.
This photo shows the different levels of body organization. Body organization is separated with levels from smallest to largest. Cells (which is the smallest), then tissue, next organ, finally body systems. Different tissues combined make up organs.