2. What are…
Invertebrates are animals that have
no backbone . Although many are
small and therefore difficult to
see, are immensely varied and are
everywhere , making up about 97
% of all known animal species.
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3. Most invertebrates change shape as they grow.
This change , known as metamorphosis, allows
youth and adults to live differently .What can
improve the chances of finding food and
disperse in different ecosystems.
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Metamorph
osis
4. Reproduction
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Invertebrates have a wide
range of reproductive
techniques, and among these
include species of animals
that reproduce asexually and
sexually. All invertebrates are
oviparous or ovoviviparous .
Once the egg hatch , need not
have the final form , which
will adult . There may be
changes in body structure. In
the past it was thought that
juveniles and adults , were
two different species. This
change we call
5. How do we classify
invertebrate animals?
(1)
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6. How do we classify
invertebrate animals?
(2)
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7. Molluscs
These invertebrates
have soft bodies,
and most also have
a hard shell. They
absorb oxygen
through gills, and
reproduce by
laying eggs.
Mussels, snails
and oysters are
examples of
molluscs.
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11. Coelenterates
These animals
have a soft body.
Some have long
tentacles. They
absorb oxygen
through their
skin. They
reproduce by
growing a bud, or
small body part.
Eventually the
bud breaks off
and grows into a
new organism. Ximena Mencía Pizarro Pelayo 5º Primary
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15. Porifera
These
invertebrates have
a soft bodies with
holes called pores.
They absorb
oxygen and
nutrients
through the pores.
Like coelenterates,
they reproduce by
forming buds.
Sponges belong to
this group.
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17. Echinoderms
These animals
have bodies
covered with sharp
spikes. Some also
have arms and
tentacles. Some
echinoderms have
gills others absorb
oxygen through
their skin.
Echinoderms hare
oviparous . Star
fish hare and
example of
echinoderms.
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19. Arthropods
These
invertebrates have
an exoskeleton
and jointed legs
that bend. Some
arthropods have
simple lungs.
Others like crabs
and lobsters
absorb oxygen
through their
gills, arthropods
are oviparous
insects, spiders
and crustaceans.
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24. Annelids
These animals
have a long, soft
body that is
divided into rings
called segments.
Some annelids
absorb oxygen
through their
skin, but others
have gills.
Annelids can
reproduce by
budding, like
Porifera and
echinoderms, but
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