Final answer:
The biota in the Cambrian period experienced significant changes, resulting in the emergence of diverse animal species. The dominant species during this period was the trilobite. The Cambrian period is known for the Cambrian explosion, which marked the rapid diversification and evolution of animal species.
Step-by-step explanation:
The biota in the Cambrian period underwent significant changes, leading to the emergence of a diverse range of animal species. One of the most dominant species during this period was the trilobite, which was among the first animals to exhibit vision. Thousands of different species have been identified in fossil sediments of the Cambrian period, but none of them survive today.
Following the Cambrian period, further animal evolution occurred during the Paleozoic Era, with the emergence of new orders, families, and species. The Ordovician period, which followed the Cambrian period, saw the first appearance of plant life on land and the adaptation of aquatic animal species to invade land.
The Cambrian period is known for the phenomenon called the Cambrian explosion, which refers to the rapid diversification and evolution of animal species. The majority of animal phyla known today emerged during this period, but there is evidence suggesting the existence of additional complex animals before the Cambrian period.