Answer:
1. meaning - the most well known from humans for being extinct
2. exclusively vegetarian diet
3. Jurassic Park
Step-by-step explanation:
1.you can see how some of the most famous extinct animals that ever lived would have sized up against an average human being--which will give you a good idea what "big" really means!
2. -in Pliocene and Pleistocene South America, rearing up on their stocky hind legs to rip the leaves off trees (and fortunately leaving the other mammalian megafauna to themselves, since sloths are confirmed vegetarians).
3. Granted, you probably already have a sense of how big Brachiosaurus was from repeated viewings of Jurassic Park. [2, 1]