How do you know that an organism belongs to the animal kingdom?It breaks down things in nature, it can survive in extreme conditions, and has at least one cell. It is a single-celled organism that can make its own food, and that can breathe and move around. It can make its own food, it can breathe and move around, and it has many cells. It cannot make its own food, it can breathe and move around, and it has many cells.