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Description
Dimensions:
The smallest individuals reach a length of not more than 1 cm with a weight of several micrograms, and the largest individuals reach up to 2 meters, weighing about 10-11 kg.

Diet:
many species are passive filtering organisms at all stages of the life cycle. A small number of them in the adult state are predators and scavengers. They are very easy to distinguish:
-Predators look more like cephalopods;
- scavengers - on starfish
- filtering - on a hybrid of sea lilies and squids.
Some individual species can grow algae on their tentacles, like some jellyfish on our planet.

Area:
Inhabit almost all seas and oceans and to a lesser extent lakes. Many of them are deep-sea inhabitants, who see a rather passive lifestyle.

Anatomy:
presumably, the common ancestor of all animals possessed the rudiments of gills, stomach, and other organs (and it is possible that he already had internal organs). According to other versions, they developed internal organs independently of other groups. But at the moment, it is generally accepted that he initially possessed the rudiments of internal organs, which they could develop independently. (Just as mammals and birds independently developed warm-bloodedness and a four-chamber heart).

The circulatory system is not closed. Blood is an analogue of hemocyanin.

The nervous system has an almost perfect symmetrical shape. There are slight bulges at the base of the eye stems. Presumably, these are ganglia.

Unlike cephalopods, instead of a beak, they have a toothy pharynx.

Individuals are dioecious. The larvae themselves are asexual and only when they become adults, become females or males.

Description
Dimensions:
The smallest individuals reach a length of not more than 1 cm with a weight of several micrograms, and the largest individuals reach up to 2 meters, weighing about 10-11 kg.

Diet:
many species are passive filtering organisms at all stages of the life cycle. A small number of them in the adult state are predators and scavengers. They are very easy to distinguish:
-Predators look more like cephalopods;
- scavengers - on starfish
- filtering - on a hybrid of sea lilies and squids.
Some individual species can grow algae on their tentacles, like some jellyfish on our planet.

Area:
Inhabit almost all seas and oceans and to a lesser extent lakes. Many of them are deep-sea inhabitants, who see a rather passive lifestyle.

Anatomy:
presumably, the common ancestor of all animals possessed the rudiments of gills, stomach, and other organs (and it is possible that he already had internal organs). According to other versions, they developed internal organs independently of other groups. But at the moment, it is generally accepted that he initially possessed the rudiments of internal organs, which they could develop independently. (Just as mammals and birds independently developed warm-bloodedness and a four-chamber heart).

The circulatory system is not closed. Blood is an analogue of hemocyanin.

The nervous system has an almost perfect symmetrical shape. There are slight bulges at the base of the eye stems. Presumably, these are ganglia.

Unlike cephalopods, instead of a beak, they have a toothy pharynx.

Individuals are dioecious. The larvae themselves are asexual and only when they become adults, become females or males.