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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 |
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