Final answer:
Sponges are a type of invertebrate that have unique adaptations to help them survive, such as their porous body, regenerative abilities, and reproductive strategies.
Step-by-step explanation:
One invertebrate is the sponge, which is an aquatic invertebrate belonging to the phylum Porifera. Sponges have evolved unique adaptations that help them survive in their habitats. For example, their porous body allows them to filter feed on tiny particles in the water, and their ability to regenerate enables them to repair injuries or grow new parts. Additionally, sponges can reproduce both sexually and asexually, which increases their chances of survival.