EVERYDAY SCIENCE

Detailed explanation-1: -Sponges are multicellular animals, unique in many ways. They are the only group of animals that can be classified as asymmetric, which means they possess no symmetry at all. There is no plane through their bodies where you could cut them in half to produce two mirror images.

Detailed explanation-2: -Porifera is mostly asymmetrical. Asymmetrical means that any plane traveling through the body’s central axis does not divide the organism into two equal halves.

Detailed explanation-3: -Only sponges (phylum Porifera) have asymmetrical body plans. Some animals start life with one type of body symmetry, but develop a different type as adults; for example, sea stars are classified as bilaterally symmetrical even though their adult forms are radially symmetrical.

Detailed explanation-4: -Phylum Porifera (sponges): Aquatic animals with radial symmetry or irregular shapes. Water enters by many incurrent pores that often lead to a central cavity.

Detailed explanation-5: -Sponges are considered to be asymmetrical animals. Although parts of many sponges show radial symmetry, the individual organism as a whole is asymmetrical in most cases.