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These are the most frequently used words in this book.
age
ageing
ago
air
animals
antioxidant
bacteria
between
billion
body
cannot
carbon
case
cells
cent
changes
chapter
conditions
damage
different
disease
dna
does
down
early
earth
effect
electrons
energy
enzyme
even
evidence
evolution
evolved
example
fact
factors
few
first
form
free
genes
genetic
high
however
hydrogen
iron
known
less
levels
life
lifespan
little
live
long
may
means
might
million
mitochondria
mitochondrial
molecules
must
need
new
number
oceans
old
organic
own
oxidative
oxygen
people
per
peroxide
photosynthesis
plants
produce
proteins
radiation
radicals
rate
reaction
rocks
see
seems
sex
should
similar
stress
theory
time
today
two
vitamin
water
without
work
world
years
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