H2O:
The
Molecule
of
Life H2O,
or
water,
is
perhaps
one
of
the
most
important
molecules
for
life
on
Earth.
It
is
essential
for
all
living
organisms,
from
the
smallest
bacteria
to
the
largest
mammals.
Despite
its
simplicity,
water
is
a
complex
molecule
that
plays
a
number
of
important
roles
in
biological
processes. Water
is
made
up
of
two
hydrogen
atoms
and
one
oxygen
atom,
bonded
together
by
covalent
bonds.
The
molecule
is
polar,
meaning
that
it
has
a
positive
charge
on
one
end
and
a
negative
charge
on
the
other.
This
polarity
allows
water
to
form
hydrogen
bonds
with
other
water
molecules,
as
well
as
with
other
polar
molecules. One
of
the
most
important
functions
of
water
is
as
a
solvent.
Because
of
its
polarity,
water
can
dissolve
a
wide
range
of
substances.
This
makes
it
possible
for
cells
to
carry
out
essential
chemical
reactions,
as
well
as
transport
nutrients
and
waste
products
in
and
out
of
the
cell. Water
also
plays
a
crucial
role
in
regulating
body
temperature.
When
the
body
becomes
too
warm,
sweat
glands
produce
water
which
evaporates
from
the
skin
surface,
cooling
the
body.
The
presence
of
water
in
the
atmosphere
also
helps
to
regulate
temperature
on
a
global
scale,
through
processes
such
as
evaporation
and
precipitation. In
addition,
water
is
essential
for
photosynthesis,
the
process
by
which
plants
convert
sunli『了解更多 星座配对查询文章请关注 :好缘网,WWw.IhaoyuaN.cC〗】ght
into
energy.
Chlorophyll,
the
pigment
responsible
for
capturing
light
energy,
is
housed
in
water-filled
structures
within
the
plant
cell. Overall,
H2O
is
an
incredibly
versatile
molecule
that
is
fundamental
to
life
as
we
know
it.
From
its
role
as
a
solvent
to
its
significance
in
regulating
temperature
and
facilitating
important
biological
processes,
water
is
truly
the
molecule
of
life.