In the integument of the body of cephalopods there are pigment cells. Changing their shape, mollusks quickly change color, disguising themselves to the color of surrounding objects. Many cephalopods have an ink sac. In case of danger, the mollusk releases ink into the water and hides behind the resulting curtain. They grab food with their tentacles and tear them apart with their beak-shaped jaws.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.