An especially common problem is corneal ulcers in animalss, which may develop spontaneously.

An especially common problem is eye ulcers, which may develop spontaneously.

Or did it just develop spontaneously because technology made it possible?

However, because achondroplasia most often develops spontaneously, prevention is not always possible.

The bonds that link group members to one another and to their group as a whole are not believed to develop spontaneously.

No one had expected his powers to start developing spontaneously while Alroy was still alive- but they had.

In the vast majority of cases, however, macular holes develop spontaneously.

It is the only species, apart from humans, that spontaneously develops colon cancer.

Left without any training in traditional sign languages, the subjects spontaneously developed their own, and have since taught it to new generations of deaf subjects.