Unit 2 the reptiles.
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Transcript of Unit 2 the reptiles.
Vertebrate animals have a backbone.
They are classified in mammals, birds, fish,
reptiles and amphibians.
ReptilesTurtles, crocodiles and snakes are reptiles.
Most of them are terrestrial.
Characteristics
Their bodies have scales. http://www.youtube.com/watch?NR=1&v=CLtkB60JRkY
Tortoises have a hard shell that protects their inside organs.
shell
Reptiles have four limbs that are four legs.
Snakes don´t have legs and move their bodies to crawl.
Most reptiles have teeth some used them to inject venom.
Fang
Reptiles breathe through lungs
lungs
Their body temperatures are not constant. Their temperatures
depend on the environment. of their environment.hotcold
The reptiles are oviparus and they don´t incubate their eggs.
Fertilization takes place inside the female.
Eating habits of reptiles.Depending on what they eat
Reptiles can be :
Carnivorous herbivorous
Carnivorous reptiles are the most abundant.
There are less herbivorous
Reptiles.
Characteristics of amphibiansCharacteristics of amphibians
Amphibians are oviparous.Fertilization takes place outside the body.
fertilization
http://www.youtube.com/watch?NR=1&v=UdelWdbrwww
A tadpole is born from each egg. After they come out of the egg, they change into adults.
Metamorphosis of a frogMetamorphosis of a froghttp://www.youtube.com/watch?v=5GGuEr-MQf4
Amphibians breathe through their wet skin and their lungs .
Lung
Their bodies have no scales or hair.
Their bodies temperature is not constant.
Cold in the water. Hot in the sun.
Amphibians have four limbs.
Newts have tail. Frogs don´t have tails
What amphibians eatWhat amphibians eat
Tadpoles eat aquatic plants
Amphibians change thier eating habits with age:
Adults are carnivores. They eat insects, snails and small vertebrates.