How many of the animal phyla include single celled animals?

None of the animal phyla include single celled animals.

Majorly all group of animals are classified under the kingdom Animalia. The chief characteristic is that all species of animals are eukaryotic and multi -cellular. The animals have a heterotrophic mode of nutrition unlike plants and algae which are autotrophs. Most organisms of this kingdom are motile and reproduce sexually only with few exceptions. The body of the animals is well organized into tissues or complex organ for performing specific functions.