All of the organisms depicted are similar in the presence of organs or organoids necessary to support life, the difference is in the complexity of organisms and their organs.
In the body of living beings, such vital processes as nutrition, respiration, excretion, growth and development, as well as reproduction and metabolism and energy occur.
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.