Is it possible to accurately draw a line between the animal and the rest of the kingdoms of organisms?

This line is relative, since representatives of all kingdoms have:
1) similar metabolic mechanisms;
2) consist of cells that are similar in chemical composition and structure;
3) a universal genetic code.
Some organisms have a mixed diet, such as euglena. Mushrooms, like animals, store glycogen.

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.