These are the most frequently used words in this book.
acids
air
allows
animals
area
bacteria
below
between
blood
body
called
carbon
carry
cause
cells
changes
characteristics
chromosomes
concentration
conditions
contains
control
diagram
different
dioxide
disease
dna
does
during
effects
energy
environment
enzymes
example
explain
food
form
function
gene
give
glucose
growth
heart
high
hormone
human
important
large
leaves
light
living
lungs
materials
may
means
might
molecules
muscle
must
need
number
opposite
organisms
oxygen
page
part
photosynthesis
plant
population
process
produce
products
protein
provide
rate
respiration
results
see
seed
shown
shows
small
soil
solution
species
structure
suggest
surface
system
table
take
temperature
time
tissues
two
understand
use
used
wall
water