Most animals are able to actively move – move and make movements. Although there are still animals (sponges) or sedentary animals (polyps). Although even they in the same developmental stages have free-swimming larvae, which ensure the spread of the species and its dispersal across the planet.
All animals are heterotrophs, that is, they feed on ready-made organic compounds. All animals are eukaryotes (their cells have a nucleus).
Animal cells do not have plastids, but have a membrane that consists of a glycocalyx and a plasma membrane.
The body shape of animals is constant, and its cavity contains vital organs.
Most animals have a nervous system that provides reflexes and taxis. An animal organism does not grow throughout its entire life cycle, but only during certain periods of its development.
Most animals absorb nutrients from the outside through ingestion.
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.