Phylum Vertebrata has the most complex animals.
social animals
the most complex group of invertebrate is cnidarians
Because of their complex organs, circularitory systems, nervous systems, and gas exchange systems.
Segmented Worms
Society
A group of crows are called a murder ...
A therapsid is a group of animals consisting of mammals and their ancestors. They are notable for their complex jaws and evolved teeth and their upright posture.
invertabates are the animals with the most extinctions
Insects
Spongest have the most complex body systems and they are very flowwy
Animalia-- animals
Except for the brain, humans have a body that is as complex as any other mammal's.