Here's why:

* Mule: A mule is a hybrid animal, a cross between a male donkey and a female horse. Mules are sterile and cannot reproduce.

* Worker Bees: Worker bees are sterile and do not reproduce.

* Some Plants: Certain plants can reproduce asexually, meaning they don't need another plant to produce offspring. However, some plants have become extinct because they lost their ability to reproduce.

Therefore, not all living things are able to reproduce.