These are the most frequently used words in another edition of this book.
2002
able
africa
age
ago
although
america
animals
another
art
bc
between
called
case
cells
century
change
chapter
chimpanzee
china
cit
civilisations
countries
course
culture
day
developed
different
disease
dna
does
during
earlier
earth
europe
even
example
fact
far
few
figure
first
food
form
found
genes
group
hand
human
language
later
less
life
light
living
man
may
might
million
molecules
nature
new
north
now
number
op
organisms
others
part
people
place
plants
point
present
proteins
quest
reason
result
science
scientists
search
second
see
should
since
south
species
sun
technology
therefore
time
today
two
use
used
water
words
world
years
yet