Here are the identified errors and a revised version of your passage with two additional sentences:
Errors:
- Verb Tense Consistency: "would compete" could be simplified to make the sentence clearer and maintain tense consistency.
- Comma Usage: The sentence beginning with "As a fierce carnivore" is correct but could flow better with some rephrasing.
- Redundancy: Mentioning "hunted in packs" is sufficient without needing to explain the advantage twice.
- Minor Repetition: Using "compete" and "defend" closely together can feel repetitive.
Revised Passage:
"The Ceratosaurus competed with other dinosaurs in its habitat, often to defend its territory. As a fierce carnivore, it is believed that ceratosaurs hunted in packs, which would have given them an advantage in taking down larger prey. This social behavior not only increased their hunting success but also allowed them to protect each other from rival predators. Additionally, the Ceratosaurus had distinctive features, such as its bony crest and sharp teeth, which made it a formidable presence in the Late Jurassic period."
This revision adds depth by discussing social behavior and physical characteristics, improving the overall context.