Download - Unit 2 - Vertebrates
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They don’t have a skeleton or a backboneMost of them are very small
Most of them are symmetricalMany of them are protected by a shell or an exoskeleton
Many invertebrates live in th sea, others in the land
Characterisctics Most of them can move, but some attach themselves to rocks or the sea floor Parasites live inside other animals
They are oviparous
MolluscsArthropodsWorms
GROUPS CnidariansEchinoderms
Sponges
MOLLUSCS ARTHROPODS WORMS CNIDARIANS ECHINODERMS SPONGES
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Have an external exoeskeleton made up of many small plates and covers the legs, body and antennaeThe exoeskeleton is rigid, but from time to time the arthropods shed it and grows a new, flexible one.
CHARACTERÍSTICS Their organs are well developed, they have antennae and eyes (simple or compound)
Their body is divided in 3 parts: head, torax and abdomenINSECTS The torax has 6 legs
Some have 4 wings E.g: butterflies, flies, etc.
The body is divided in 2 parts: cephalothorax y abdomenHave 8 legsThey haven’t antennae
ARACHNIDS E.g: spiders, scorpions, etcGROUPS
The body is divided in 2 parts: cephalothorax y abdomen Have antennae
CRUSTACEANS Have 10 or more legs, the first 2 are pincher clawsThey are acuaticE.g: Lobsters, shrimps, crabs, etc.
The body is divided in 2 parts: head and thorax formed by ringsHave many legs
MYRIAPODS Have 2 antennaeE.g: centipedes, millipedes, etc
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They have an inner exkeleton and backbone
Its body it’s divided into: head, trunk, limbs and sometimes tailCaracterísticas Groups: amphibians, fish, reptils, birds, mamals
They have head, trunk and a tailIts body is covered with scales and use their fins to swim.They are oviparous
Characteristics They breathe through gills located on the sides of the head
Most are terrestrialMost of them have a head, a trunk, limbs and a tail
They need external heat, for these reason are called cold-blooded animalsThey breathe through lungs
Characteristics They are oviparousMost are carnivorous
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They have head, trunk and limbs
They can live on land but stay in, or near water to keep their skin moistThey are oviparous
The female lay eggs in pounds or rivers
Characteristics As young amphibians grow, their appearance changes completely
They have a head, a trunk, limbs and a tail The front limbs are wings and the back limbs are legs A bird’s skin is covered with feathers
Using their wings most birds can flyThey are called warm-blooded animals because their body temperature is constant
They breathe through their lungs They warm the eggs Witt their body, this is called incubation All are terrestrial but some spend a lot of time in water
Características Each bird species eats its own food: seeds, fruit, insects or other birdsThey have a beak.
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They have a head, a trunk, limbs Most have legs but some have fins, and bats have wings
Characteristics Have a body covered with hair or fur They are warm blooded animalsThey breathe air trhough their lungsAre viviparous, grow inside the female’s body
Baby mammals drink their mother’s milk Most are terrestrial, although some are aquatic (Dolphin)
Terrestrial The live on land.Mice, bears. kangaroos, edgehog...
TYPES OF
MAMMALS AquaticThey breathe air through their lungs
They feed their babies with milk Whale, dolphin
They can flyAerial They hunt using a kind of sonar
Bats