Question

Bilateria are characterized by Multiple Choice a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body. a plane of symmetry that forms mirror images around a horizontal plane in the midline. a plane of symmetry that forms mirror images around a vertical plane in the midline. a plane of symmetry that forms mirror images around an oblique plane in the midline.

Answer 1

Bilateria are characterized by bilateral symmetry, which means there is one plane of symmetry creating two mirror-image sides along a vertical plane in the midline. Bilateral symmetry is linked to active movement and cephalization in animals such as butterflies, goats, and humans.

Step-by-step explanation:

Bilateria are characterized by a specific type of symmetry in their body plan known as bilateral symmetry. This means that there is only one plane of symmetry that can divide the organism into two mirror-image sides. Specifically, bilateral symmetry is defined as a plane of symmetry that forms mirror images around a vertical plane in the midline, creating distinct right and left sides of the organism that are mirror images of each other. This type of symmetry is associated with the presence of a "head" and "tail" (anterior versus posterior), a back and underside (dorsal versus ventral), and the phenomenon of cephalization, which is the development of a head with an organized nervous system.

Examples of animals with bilateral symmetry include butterflies, crabs, goats, and humans. The evolution of bilateral symmetry allows animals to move in a streamlined and directional manner, which is beneficial for seeking resources and engaging in predator-prey interactions. Unlike radial symmetry, which is common in stationary aquatic animals, bilateral symmetry is suited for active and controlled mobility.

Answer 2

A plane of symmetry that forms mirror images around a vertical plane in the midline.

Step-by-step explanation:

Bilateria are animals that have a bilateral symmetry,

Bilateral symmetry refers to organisms that are mirror images along their midline called a sagittal plane.

Examples of bilateria include butterflies and humans because, a line through their midline divides the organism into two identical halves which are mirror images of each other.

So, Bilateria are characterized by a plane of symmetry that forms mirror images around a vertical plane in the midline.