EVERYDAY SCIENCE

Detailed explanation-1: -Vertebrates possess bilateral symmetry by their very nature; the structure of vertebrae themselves are bilateral. But arthropods are also bilaterally symmetrical, and it is not beyond imagining that a sufficiently evolved arthropod might produce an industrial-technological civilization.

Detailed explanation-2: -Humans and many other animals exhibit bilateral symmetry. In the ocean world, most marine creatures, including all vertebrates and some invertebrates exhibit bilateral symmetry.

Detailed explanation-3: -All vertebrates display bilateral symmetry. Fish, and other bilaterally symmetrical animals, have different bodily regions such as anterior, posterior, dorsal, and ventral portions.

Detailed explanation-4: -Importantly, she notes, not all animals are bilaterally symmetrical. Some animals have radial symmetry with four or five axes, like starfish, jellyfish and sea urchins. The only creature on Earth who is not symmetrical in any way is the sponge.

Detailed explanation-5: -The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis. It is found in all invertebrates and a few vertebrates.