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Animal Growth and Reproduction
Science, Grade 4
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Study Guide Animal Growth and Reproduction Science, Grade 4
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4
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ANIMAL
GROWTH
AND
REPRODUCTION
Life
Cycles
A
life
cycle
is
the
stages
of
development
an
organism
goes
through
starting
from
an
egg
to
growing
into
an
adult.
Living
organisms
each
have
their
own
unique
way
of
reproducing,
giving
birth,
growing,
and
developing.
Organisms
such
as
mammals
and
birds
have
simple
life
cycles.
These
organisms
look
similar
to
their
parents
when
they
are
born.
Many
organisms,
however,
have
complex
life
cycles
and
do
not
look
like
their
parents
when
they
are
born.
Lesson
Checkpoint:
What
is
a
life
cycle?
Metamorphosis
Metamorphosis
is
the
process
of
a
rather
sudden
change
in
the
appearance
and
form
of
an
animal
while
growing
into
an
adult.
Organisms
that
go
through
incomplete
metamorphosis
go
through
three
stages
of
development:
egg,
nymph,
and
adult.
Lesson
Checkpoint:
What
are
the
three
stages
of
development
in
incomplete
metamorphosis?
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Organisms
that
go
through
complete
metamorphosis
go
through
four
stages
of
development
while
include:
egg,
larva,
pupa,
and
adult.
Most
insects
go
through
complete
metamorphosis.
Lesson
Checkpoint:
How
many
stages
are
in
complete
metamorphosis?
Animals
produce
offspring
in
a
variety
of
ways.
•
Many
animals
have
live
births,
which
is
when
their
offspring
develop
inside
the
female
parent
and
then
the
parent
gives
birth
to
the
live
young.
This
type
of
development
is
called
internal
development.
•
Other
organisms,
like
chickens
and
frogs,
lay
eggs
instead
of
having
live
births.
External
development
is
when
an
organism
develops
outside
of
an
organism.
Animal
life
cycles
vary
in
how
long
they
take.
Some
animals
have
short
life
cycles
while
others
take
longer.
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Reproduction
Organisms
also
reproduce
in
several
different
ways.
Reproduction
is
the
creation
of
a
new
individual
or
individuals
from
existing
individual
or
individuals.
Fertilization
Fertilization
is
the
union
of
a
male
sperm
and
a
female
egg
to
form
an
offspring.
This
is
one
way
animals
reproduce.
Internal
fertilization
takes
place
inside
an
organism.
Fertilization
does
NOT
need
to
take
place
in
every
organism
in
order
for
reproduction
to
occur.
A
single
individual
can
produce
offspring
without
fertilization
from
another
organism
without
fertilization
taking
place.
This
is
called
asexual
reproduction.
Some
animals
develop
inside
the
parent
organism,
as
in
those
who
have
live
birth,
and
it
is
called
internal
development.
External
development
is
when
an
organism
develops
outside
of
an
organism.
Budding
is
the
process
of
an
offspring
growing
out
of
the
body
of
the
parent.
Hydras
are
an
example
of
an
organism
that
reproduces
asexually
through
this
process.
If
a
piece
of
a
parent
is
detached,
and
it
can
grow
and
develop
into
a
completely
new
individual,
this
process
is
known
as
regeneration.
Some
types
of
worms
and
starfish
can
regenerate
in
this
way.
Lesson
Checkpoint:
What
are
two
ways
an
organism
can
reproduce
asexually,
without
fertilization
occurring?
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Traits
Animals
have
both
inherited
and
acquired
traits.
An
inherited
trait
is
a
characteristic
or
quality
that
an
organism
is
born
with.
An
acquired
trait
is
a
trait
one
learns
through
its
experiences
but
is
not
born
with.
Heredity
is
the
passing
of
traits
and
characteristics
from
parents
to
their
offspring.
Lesson
Checkpoint:
What
is
the
difference
between
an
acquired
and
inherited
trait?
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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