| 
 
UID1539862在线时间 小时注册时间2023-3-7最后登录1970-1-1主题帖子性别保密 
 | 
| 1.Before T.rex, T petite - T.rex broke T mold, tripling body mass over predecessor
 2. factors lead to giganitism:
 -recent years: increase level of co2->plant->herbivorous dinosaur preyed
 -meeting:SS team
 3.team identified prerequisites:
 -cold-blooded
 -extensive geographic ranges+ low population densities+bigger areas continent- size landmassed
 -competint large species
 4. critics: conclusion hard to swallow
 -K.P.:
 -dinosaurs warm-blooded mamels in bone histology
 -impossible to determine population size of extinct animals
 -But so far: fossil record uphold team models
 -5 known heavyweights only on vast landmassess
 5. strongest support: rise of T.rex
 -wastern interior seaway: both sides 3 T. roamed
 -water retreated, doubling available habitat: 1lineage remained
 | 
 |