All vertebrates have bilateral symmetry and a true coelom. At the base of the phylogenetic tree, neither sponges nor cnidarians have a coelom. Sponges have an asymmetric body plan; cnidarians have radial symmetric plan. What advantages do the bilateral symmetry and the coelom give to animals?

The bilateral symmetry allows for ;  Directional movement  

The presence Coelom gives animals;  Freedom of movement of internal organs and protects the internal organs

The Bilateral symmetry represents an equal vertical arrangement around a vertical plane as seen in animals. A bilateral symmetry divides an animal into equal left and right portions.

The presence of coelom allows for the freedom of movement within the internal organs independent of the external body wall. also the coelom protects the internal organs of the animals ( i.e acts as a protective cushion ).

Hence we can conclude that The bilateral symmetry allows for ; Directional movement  and The presence Coelom gives animals ; Freedom of movement of internal organs and protects the internal organs

Bilateral symmetry allows for directional motion. The coelom cushions organs allow freedom of motion.

Explanation:

Most animals are bilaterally symmetrical in nature with a line of symmetry dividing their body into two sides left and right sides along-with a “head” in top and “tail” in the bottom. Bilateral symmetry consisting an equal arrangement of symmetry about a vertical plane running from top to bottom.

The coelom is known as the main body cavity present in most animals. It is positioned inside the body to surrounds the digestive tract and other organs. In some animals, it is lined with mesothelium. In other animals, such as mollusks, it is undifferentiated. In animals, it helps to allow freedom of motion.

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