____________________
structure
is
an
example
of
an
organ
or
bone
that
appears
in
different
animals
,
underlining
anatomical
commonalities
demonstrating
descent
from
a
____________________
ancestor
.
____________________
structures
pertain
to
the
various
structures
in
____________________
species
having
the
same
appearance
,
structure
or
function
but
have
evolved
separately
,
thus
do
not
share
____________________
ancestor
.
Darwin's
Postulates
:
1
)
Variations
of
____________________
Different
members
of
a
population
have
all
kinds
of
individual
variations
,
this
characteristics
(
body
size
,
hair
color
,
blood
type
,
metabolism
,
reflexes
)
are
known
as
phenotypes
2
)
____________________
These
variations
are
heritable
and
can
be
passed
on
to
the
organism's
offsprings
.
In
order
for
the
favorable
trait
to
be
helpful
for
the
population
,
the
organism
must
be
able
to
pass
it
on
to
future
generations
.
3
)
Populations
can
have
more
____________________
than
____________________
(
food
&
water
)
can
____________________
.
Darwin
called
this
the
struggle
for
existence
,
inspired
by
the
work
of
Thomas
Malthus
who
said
that
when
human
population
gets
to
big
,
we
face
things
like
wars
,
famines
and
plagues
.
4
)
____________________
and
____________________
Rates
Those
with
favorable
traits
are
more
likely
to
survive
and
reproduce
.
It
is
also
based
on
the
previous
ideas
.
