These are the most frequently used words in this book.
age
ago
algae
along
animals
another
bacteria
beds
between
billion
biological
biology
branches
cambrian
carbon
carbonate
cells
chapter
chemical
cherts
common
contain
cyanobacteria
different
early
earth
environmental
environments
eukaryotes
eukaryotic
even
evidence
evolution
evolutionary
features
few
figure
first
form
formed
fossils
found
genes
great
group
history
however
ice
iron
know
late
least
life
living
long
matter
may
membrane
might
million
modern
molecular
molecules
must
new
oceans
organic
organisms
oxygen
photosynthesis
place
planet
processes
proteins
proterozoic
provide
record
rna
rocks
sea
sedimentary
sediments
shales
show
simple
small
spitsbergen
stromatolites
structures
suggest
surface
thus
time
today
tree
two
warrawoona
water
world
years