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ANIMALS (NATURAL SCIENCE UNIT 3)
Transcript of ANIMALS (NATURAL SCIENCE UNIT 3)
They have a backbone and an internal skeleton.
are living things that eat other living things.
they eat plants
they eat other animals
they eat meat
shape of the bird's beak
The shape of the bird's beak depends on what it eats.
Their beaks are short and thick.
Their beaks are strong, sharp and hooked.
Their beaks are large and long.
Their beaks are long and thin.
A ruminant is any mammal that digests its food in two steps.
Ruminants digest food partly in the digestive system, but then it returns to the mouth. The animal chews the grass to break it down more and swallows it again. The grass returns to the digestive system and the process is completed.
Examples: cows, sheep, goats, giraffes, deer and camels.
All animals need to take in
mammals, BIRDS and reptiles
Mammals, birds and reptiles use
to breathe. They take the oxygen from the air and take out the carbon dioxide.
Fish breathe through the
. They take the oxygen from the water and expel the carbon dioxide through the gills.
Amphibians breathe through their gills when they are tadpoles but after the
they develop lungs to breathe when they are adults. They also breathe through their moist skin.
When the animals don´t have offspring (babies) they can become extinct.
Most animals reproduce
. The ova produced by the female are fertilised by the sperm, produced by the male.
Animals can be
The embryo develops inside the mother. Babies are born live.
All baby mammals drink their mother’s milk until they can find their own food.
The embryo grows inside an egg, outside the female’s body.
The shell or jelly around the egg protects the embryo. The egg contains the nutrients it needs to grow.
These eggs will hatch into new offspring.
These animals (i.e.
tiger shark, boa, manta ray
) produce eggs but the eggs develop and hatch inside the mother. Later, the mother gives birth to live offspring.
Some fish, reptiles and amphibians are ovoviviparous.
Invertebrates don’t have a backbone.
We can classify invertebrates into six groups:
OTHER INVERTEBRATE GROUP
(ECHINODERMS, ANNELIDS, SPONGES and
This is the largest invertebrate group.
They have an external skeleton called an
There are four subgroups:
This large group of invertebrates is divided into three subgroups:
OTHER INVERTEBRATE GROUPS
have two body parts: a
is very hard.
5 pairs of legs
and the front pair of legs has
They also have
have long, thin,
many pairs of legs
They live in dark places.
have two body parts: a
made up of the head and the thorax and an
4 pairs of legs
and up to 8 eyes.
have three body parts: a
All insects have two
three pairs of legs
(joined to the thorax).
Most insects have
one or two pairs of wings
They live at the bottom of the sea. They are covered by a
They live in water. They are the simplest invertebrates. They have no muscles, nervous system or circulatory system.
CNIDARIANS (i.e. jellyfish and anemones) live in the sea. They have a soft,
with one opening. This opening is surrounded by
They have a
. Many annelids are
and live inside the bodies of other animals. Most annelids live in water, but they can also live on land.