1) Symbiotic. Mutually beneficial relationship of organisms; hermit crab – sea anemones, ant – aphids, rhino – ox birds, aspen – boletus. 2) Predator – prey (predators restrain excessive reproduction of herbivores and reduce the spread of various diseases among them). 3) Competition between species with similar needs (pike and perch, wolves and foxes).
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.