Yes, for example, insects. In larvae and adult insects, lifestyle can be fundamentally different. For example, the skin gadfly larva is an endoparasite of large vertebrates, while adult gadfly does not even have a mouthpart. Females lay eggs on animal hair. Larvae emerge from the eggs. They make long strokes in the body of the animal, actively feed and grow. In spring, the larvae fall out of the ulcer and pupate in the ground. An adult insect emerges from the pupa, which lives and lays eggs at the expense of nutrients accumulated by the larva. It is associated with the preservation of the number of species, at the larval stage, many organisms are less protected, therefore special conditions, organs, type of nutrition, etc. are necessary.
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.