Final answer:
The statement is true. The question asks about the fossil record of theropods but provides reference data about trilobites. Trilobites have an extensive fossil record; however, the question's answer depends on the fossil record of theropods, not trilobites.
Step-by-step explanation:
The question is whether it is true that theropods have an extensive, very complete fossil record. This question is related to the study of paleontology, a sub-discipline of biology concerned with the fossilized remains of ancient life forms. While the question mentions theropods, the information provided for reference talks about trilobites, which are well-documented arthropods that lived from approximately 521 to 250 million years ago. They are known for their extensive fossil record due to their abundance, diversity, and widespread presence during the Paleozoic era. Although trilobites are not the subject in question, it's relevant to note that in paleontology, the fossil record can vary greatly between groups. Some species, like trilobites, have an extensive fossil record, while others do not.