Which statement is best supported by the x-rays?

The correct answer is that animal Y is an invertebrate and the animal Z is vertebrate.

Explanation:

The images of the structure found within the body can be produced with the help of X-ray. On the basis of the given image, one can witness that animal Z possess a backbone, that is, an array of small bones known as vertebrae, which elongates from the head, while animal Y does not possess the structure. The vertebrates refer to the species that exhibit a backbone, while the invertebrates are the ones that lack it.

i think the answer is

mass

true is the answer : )