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Grouping of Animals
Science, Grade 3
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Study Guide Grouping of Animals Science, Grade 3
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GROUPING
OF
ANIMALS
Animals
can
be
classified,
or
grouped
together,
by
the
things
they
have
in
common,
such
as
how
they
act,
where
they
live,
or
how
they
look.
This
is
one
way
scientists
organize
what
they
are
studying.
Scientists
separate
animals
into
two
main
groups
related
to
whether
the
animal
has
a
backbone
in
its
body
or
not.
Those
animals
with
backbones
are
part
of
the
vertebrates
group.
Those
animals
without
a
central
backbone
are
invertebrates.
Vertebrates
There
are
five
main
groups
of
vertebrates
based
on
specific
animal
traits
and
characteristics.
Those
groups
include
fish,
birds,
reptiles,
amphibians,
and
mammals.
Fish
are
vertebrates
that
live
their
whole
lives
in
water.
Fish
breathe
oxygen
through
their
gills
and
have
scales
on
their
bodies.
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Birds
are
also
a
group
of
vertebrates.
A
bird
has
feathers,
wings,
and
a
beak.
Birds
breathe
oxygen
through
their
lungs.
Reptiles
are
also
a
group
of
vertebrates.
Snakes,
crocodiles,
and
turtles
are
all
examples
of
reptiles.
Reptiles
breathe
through
their
lungs.
Another
group
of
vertebrates
are
amphibians,
which
include
frogs
and
toads.
Amphibians
live
in
water
and
on
land.
Most
amphibians
start
off
breathing
through
their
gills
in
water
at
a
very
young
age.
As
an
amphibian
grows
and
begins
to
live
on
land,
it
develops
lungs
in
order
to
breathe
on
land.
Mammals
are
also
vertebrates.
Mammals
are
animals
that
have
hair,
breathe
through
their
lungs,
and
feed
their
babies
milk
from
the
mother.
Examples
of
mammals
are
dogs,
cats,
and
humans.
Lesson
Checkpoint:
What
are
the
five
main
groups
of
vertebrates?
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Invertebrates
Now
for
the
animals
without
backbones.
Invertebrates
are
animals
that
do
not
have
a
backbone.
Most
animals
living
in
the
world
today
are
invertebrates.
A
spider
is
an
example
of
an
invertebrate.
Most
kind
of
invertebrates
are
insects,
such
as
flies.
Isn’t
it
amazing
that
there
are
more
of
this
kind
of
animal
than
vertebrates
on
the
Earth!
Invertebrates
do
not
get
as
big
as
vertebrates
are
able
to.
The
bones
and
backbone
of
a
vertebrate
helps
support
its
body,
which
means
a
vertebrate
can
be
larger.
Invertebrates
have
liquid
sacs
or
shells
that
serve
as
support
for
their
bodies.
Lesson
Checkpoint:
What
is
an
invertebrate?
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purchaser
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educational
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Four
Kinds
of
Invertebrates
There
are
four
major
kinds
of
invertebrates:
sea
jellies,
arthropods,
worms,
and
mollusks.
Sea
jellies
have
soft
bodies,
they
live
in
the
ocean,
and
they
have
body
parts
that
can
sting.
Jellyfish
are
examples
of
sea
jellies.
Arthropods’
skeletons
are
on
the
outside
of
their
bodies.
Arthropod
bodies
are
made
up
of
several
parts
and
sections.
An
example
of
an
arthropod
is
a
beetle.
Worms
are
also
invertebrates.
Worms
have
soft
bodies
and
live
underground.
Mollusks
also
have
soft
bodies,
but
most
mollusks
have
shells
to
protect
and
support
their
soft
bodies.
An
example
of
a
mollusk
is
a
snail.
Lesson
Checkpoint:
What
are
the
four
major
kinds
of
invertebrates?
© Copyright NewPath Learning. All Rights Reserved.
Permission
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granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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