Final answer:
During the Cambrian explosion, examples of living organisms include reef-building sponges and trilobites. These organisms represent the emergence of modern animal phyla during that time.
Step-by-step explanation:
During the Cambrian explosion, there were several living organisms that emerged. Some examples include reef-building sponges and early arthropods known as trilobites. Trilobites were small ocean invertebrates that became abundant during this time. These organisms represent some of the fifty modern animal phyla that emerged during the Cambrian explosion.