How are animals different from other living organisms?

Despite the various sizes, appearance, structure, all animals share common biological features. First, most animals are able to actively move around. They receive the energy they need by consuming ready-made organic substances. There are differences in the structure of the cell membrane (but more on that later).
The body of most multicellular animals is more complex than the body of multicellular plants. In particular, the organs of animals, which perform common functions, form organ systems: digestive, excretory, circulatory, respiratory, nervous, etc.
Animals, in comparison with representatives of other kingdoms, perceive environmental stimuli more sensitively and react to them more actively. Even single-celled animals are capable of fleeing danger or looking for food. And animals with a highly developed nervous system can learn from their experience. This ability is inherent only in animals. By reacting to changes in the external environment, animals can quickly adapt to them. In animals, the regulation of vital functions is more perfect: it is provided not only by their behavior, but also the ability to understand each other is provided not only by biologically active substances, but also by the nervous system. Reproduction in multicellular animals is predominantly sexual.