[hide]1. No idea, random guess: starfishwec01 wrote:1. Which marine organism appeared in the Silurian and had a symbiotic relationship with Crinoids?
2. Which large predator dominated South America before the Great American Interchange?
3. Which non-avian dinosaur was once thought to have a second brain?
4. Which specimen had the strongest bite of any fish?
5. Which two specimens likely hunted mammoths?
2. No idea, random guess: brontothere
3. Stegosaurus
4. Random guess: Dunkleosteus
5. So ewhat random guess: Mammoths and mastodon[/hide]