BIOLOGY
Chapter
1
Exploring
Life
and
Science
Science
is
the
study
of
the
natural
world
(all
the
matter
and
energy)
.
Bio
means
life
,
Biology
specializes
in
life
and
living
organisms
.
The
Difference
of
Science
and
Biology
For
example
:
study
of
space
and
an
erupting
volcano
is
not
biology
but
science
because
they
are
non
living
things
.
However
,
study
of
animals
is
biology
because
they
are
living
.
All
life
shares
common
characteristics
.
Living
organism
examples
:
medicinal
leech
,
mushrooms
,
bacteria
,
meerkats
,
sunflower
,
Giardia
(a
parasite
that
is
stuck
in
stomach
that
causes
diarrhed
.
The
characteristics
of
Life
(living
things
7
.
Living
things
have
a
different
molecular
composition
than
non
living
things
.
·
Only
a
few
chemical
elements
(out
of
100)
are
present
in
any
abundance
in
living
organisms
.
·
96
%
of
our
body
are
only
made
up
of
only
4
elements
(oxygen
[O]
,
carbon
[C]
-
is
the
main
element
.,
Nitrogen
[N]
,
water
[20]
to
create
molecules
of
life
.
If
they
are
not
made
up
of
the
P
elements
,
they
are
non
living
.
Molecules
of
life
:
Proteins
,
carbohydrates
,
Lipids
,
Nucleic
Acids
water
is
also
essential
to
life
but
not
considered
as
molecule
of
life
because
it's
present
in
both
living
and
non
living
things
.
2
.
Living
things
use
materials
and
energy
from
the
environment
.
·
All
living
organisms
take
in
raw
materials
and
energy
from
the
environment
and
metabolize
them
into
the
molecules
and
energy
they
need
to
survive
.
For
Example
:
humans
and
animals
eat
food
and
drink
.
Humans
and
animals
must
acquire
energy
.
3
.
Living
things
are
composed
of
cells
·
is
based
on
the
Cell
Theory
(Theodor
Schwann
and
Matthias
Schleiden
,
1839)
:
~
A
cell
is
the
smallest
unit
that
exhibits
all
the
characteristics
of
life
.
~
All
cells
zome
only
from
pre-existing
cells
by
division
.
Example
:
Unicellular
made
from
one
cell
,
Multicellular
made
from
many
.
·
living
organisms
must
have
at least
one
cell
.
Humans
have
1
trillion
cells
in
our
body
,
so
we
are
multicellular
Zygote
a
fertilized
eg
.
