Do you know what defines an animal? According to information from Wikipedia, animals are multicellular organisms that are heterotrophic, meaning they obtain their nutrients from other sources. They possess eukaryotic cells, lack rigid cell walls, and are capable of movement, at least during certain stages of their life.

Here are a few animal groups that do not possess ears:

Porifera: This group includes approximately 5,000 species of sponges.

Cnidaria: Comprising around 10,000 species, this group includes jellyfish, corals, and other similar organisms.

Ctenophora: With over 100 known species, this group includes comb jellies.

These animal groups, despite lack