Question

Ribbon-like acoelomates with bilateral symmetry are examples of _____.

Cnidarians: jellyfish
Platyhelminthes: flat worms
Nemotoda: round worms
Mollusca: mollusks
Annelida: segmented worms

Answer 1

The correct answer is platyhelminthes: flatworms.

Step-by-step explanation:

Platyhelminthes are generally known as tapeworms or flatworms, these species are ribbon-like and are soft-bodied invertebrates. Some of the species of this phylum live as parasites in animals and human beings. The most distinguishing characteristic of these invertebrates is their flat and ribbon-like appearance.

Some of the characteristics of Platyhelminthes are that their body is dorsoventrally flattened, they show radial symmetry, they do not possess a body cavity and thus are known as acoelomate, they are triploblastic comprising three germ layers, and their body is soft and unsegmented.

Answer 2

The answer is Platyhelminthes: flat worms

Among those groups, cnidarians have radial symmetry so this choice is incorrect.
Among the rest groups, only Platyhelminthes are acoelomates, while other groups are coelomates. Thus, Ribbon-like acoelomates with bilateral symmetry are examples of Platyhelminthes.