Probably invertebrates and vertebrates (although "chordates" is better for vertebrates) since the two groups are technically distinguished by the presence of a ventral cord in the invertebrates and a dorsal nerve cord (in their back). All but a few minor groups of chordates have their dorsal nerve cord protected by vertebrae so commonly, most people say invertebrates and vertebrates (until high school and college).
animals are put into groups because they have different features for example snakes are scally,horses are furry and so on and so fourth like if you dint have groups you would mistake worms for a snakes because they have the same features but there in different groups.
Vertebrates and Invertebrates
Plants and animals
phyla?
Mammals & birds.
it is 4
Types of birds Types of primates
There are around 35 major groups, or "orders," of animals in the world, which can be further divided into smaller groups like families and species.
Snakes, turtles, crocodiles, and extinct animals such as dinosaurs.
Phylum
The answer to this question is, the three major groups of animals are the worms,fish,and corals they are the main type of animal except for the coral. the coral is something that is presented in the ocean that some fish live and hide inside and they are the main type of fish habitat in the ocean.
some only have three chambers