c6
Down, body, and flight are all types of ____________
feathers
mating displays, thermoregulation,
'species' are just a biological classification unit (T or F)
T
Birds evolved from within a group of small-bodied _____________ called maniraptorians
theropods
Evolutionary convergence
the evolutionary process by which one ancestor lineagesplits into two or more descendant species.
speciation
___________________ , nearly 150 years ago, provided the most compelling evidence for the dinosaurian ancestry of birds by showcasing that shared features of the hindlimb and pelvis.
Thomas Henry Huxley
barbs, rachis, and barbules are all terms associated with ___________ -structures of feathers
micro
populations that occur in separate regions with no geographic overlap are known as ____________
allopatric
incremental stages in tree-climbing, leaping from branch to branch, are all characteristics of what theory behind flight?
Arboreal Theory
based on fossil evidence we know many predecessors of birds laid eggs in sequential order (i.e., intervals, taking up to several days to lay an entire __________.)
clutch
This order represents half of all modern day bird species
passeriformes
________________ Law of Irreversibility – says that structures lost during evolution could not re-evolve
Dollo's
___________ refers to organisms or groups of organisms that occur in the same place.
Sympatry
a newly evolved trait that allows a lineage to take advantage of new ecological opportunities
key innovation