Some cells act as individual cells and are not attached to one another
Red Blood Cells: Their main function is to transport oxygen to other cells throughout the body, so they must be able to move freely through the circulatory system
Many other cells, in contrast, act together with other similar cells as part of the same tissue, so they are attached to one another and cannot move freely.
epithelial cells lining the respiratory tract are attached to each other to form a continuous surface that protects the respiratory system from particles and other hazards in the air.
All the different cell types within an individual human organism are genetically identical, so no matter how different the cells are, they all have the same genes.
