According to the principle of jet propulsion, a number of animals move in nature, for example, jellyfish, scallops, dragonfly larvae, squid, octopus, cuttlefish. Most jellyfish move in a reactive manner, pushing water out of the umbrella cavity. Scallop sea mollusks, usually lying quietly on the bottom, when approaching their main enemy – a delightfully slow, but extremely insidious predator – a starfish – sharply squeeze the valves of their shell, forcibly pushing water out of it. The larva of the dragonfly-rocker with confident jerks and jerks hides from the threat pursuing it.
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.