martes, 27 de octubre de 2009

VERTEBRATES AND INVERTEBRATES


INVERTEBRATES

Poriferan: are sea sponges


Coelenterates: are jelly fish,
corals and sea anemones.
Their bodies are soft and
almost see-through.

Arthropods: are insects,
spiders, crabs and centipedes.
They have a shell, legs and
antennae. Some of them also
have wings.

Molluscs: include snails, clams,
octopus and squid. They have
soft bodies but most of them
also have a shell.

Equinoderms: include sea urchins
and starfish. They have spines
and layers whish form a hard shell.


VERTEBRATES

fish: are acuatic, vertebrates
with scales, fins and tube.like
bodies. The are oviparous
and they breathe through.

Amphibians: include frogs
and salamanders. They are
oviparus. During their early stage
of growth they are aquatic
and their breathe through
gills. The adult animal
breathe using lungs and are
ussualy land creatures.

Reptiles: include snakes,
lizards, tortoises and
crocodiles. Most of htem
are land creatures. They
have scales, they are oviparous
and they breathe using lungs.

Bird: are land creatures.
Their bodies are covered in feathers.
They fly using wings. They are
oviparous and they breathe using lungs.

Mammals: are land creatures although some of them live in the water. Most of the have hair. They are viviparous and they breathe using lungs.

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