Answer:
Invertebrate
Explanation:
Animals that do not possess a vertebral column or backbone are called as invertebrates. They include all the animals except the ones found in subphylum vertebrata. Examples of invertebrates are arthropods, annelids, molluscs etc. They have a huge variety of species. They are heterotrophs and except Porifera are made of differentiated tissues. They also contain a digestive chamber. They have some kind of symmetry like bilateral, radial or spherical; except gastropod species which is asymmetrical.
