Answer:True
Step-by-step explanation:
There are many organisms with bilateral symmetry, including humans and other mammals. These organisms exhibit segmentation that is not seen in organisms with radial symmetry. Segmentation is a distinctive feature of bilateral microorgBilateral symmetry refers to organisms with body shapes that are mirror images along a midline called the sagittal plane. The internal organs, however, are not necessarily distributed symmetrically.
The vast majority of animals display bilateral symmetry; also known as plane symmetry, this is a trait that applies to 99% of all animals, in the majority of phyla: Chordata, Annelida, Arthropoda, Platyzoa, Nematoda, and most Mollusca.
On the other hand, the Cnidaria display radial symmetry and the Porifera exhibit no symmetry.
The Echinodermata are unique, in that they display bilateral symmetry in their larval stage, and a special form of fivefold radial symmetry, pentamerism in their adult life stage.
Bilaterally symmetrical animals have a dorsal side (top), a ventral side (bottom) and distinct left and right sides. They also have an anterior side (head), and a posterior side (tail), and exhibit cephalization. Cephalization is the clustering of sensory organs at the anterior; a body plan that arose because animals use forward motion, and so this end is the first to encounter the environmental stimuli to which an organism must react. The bilateral body plan may also be advantageous because it permits organisms to be more streamline. This would have been particularly important for ancestral organisms, which moved through the oceans.anisms present in both the body and the appendages.