1) Protective coloration: protective (fusion with the external environment), warning (bright, scares away predators who understand that such an animal should not be eaten), mimicry (imitation of less protected species to more protected ones), disguise (imitation of objects)
2) The use of various means of protection: mechanical (nails, teeth, claws, hooves), chemical (poisons, odors), electrical (electrical organs in fish)
3) Protective formations that exclude physical contact: shell, shell, spines, needles, wet integuments
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.