Molluscs and arthropods do not have a backbone

The answer is: true 

Molluscs and arthropods are invertebrate animals that do not have a backbone. This family of animals includes, for example, snails, ants, ticks, and crabs. This type of animal relies on different internal structures to compensate for the lack of a spine. For example, in mollusks, their internal structures contain a shell that protects them, and in arthropods they are distinguished by jointed legs that work to support their body and its movement. Examples of the beautiful molluscs that can be seen in the Arabian oceans are true works of art, with different types of this type of animal, you cannot help but admire them.