Final answer:
The human body shows bilateral symmetry, which extends to the placement of sensory organs and is crucial for balanced movement and perception. Rays and other fish differ in their skeletons; rays are cartilaginous fish with cartilage skeletons, while other fish have bony skeletons.
Step-by-step explanation:
The human body shows bilateral symmetry, meaning it can be divided into mirror-image halves along a vertical plane at the midline. This type of symmetry is common in the animal kingdom and relates to how organisms move and interact with their environment. In terms of senses and body parts, bilateral symmetry ensures that pairs of sensory organs such as eyes, ears, and limbs are distributed evenly on both sides of the body, allowing for balanced perception and movement.
When comparing cartilaginous fish, such as rays, to bony fish, the main difference lies in their skeletal structures. Rays have skeletons made of cartilage, whereas bony fish have skeletons made of bone. This distinction affects their flexibility, buoyancy, and methods of movement in the ocean.