These are the most frequently used words in this book.
1989
1990
1991
1992
1994
1995
al
although
among
analysis
angiosperms
animals
appear
appendages
arthropods
between
birds
body
cambrian
cell
changes
characters
data
development
devonian
different
diversity
during
early
eds
et
evidence
evolution
evolutionary
example
expression
extinction
features
fig
fins
first
forms
fossil
genes
groups
history
however
hox
insects
known
land
large
late
life
limb
living
major
may
modern
molecular
morphological
morphology
myr
nature
new
number
origin
part
pattern
phylogenetic
phylogeny
plants
press
primates
primitive
recent
record
ref
related
relationships
relative
sci
science
sequences
several
similar
soc
species
structure
studies
suggests
taxa
tetrapods
time
tree
two
univ
vertebrate
wing
york