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Seahorses are an unusual type of fsh with a head that looks like a horse's head. They do not have scales and they swim in an upright position. They are very slow swimmers, but they can quickly change colour, which provides camoufage to protect them fom predators. hat makes seahorses truly unique is their way of reproducing. !ale seahorses have a pouch where the females deposit the eggs. The males then carry the eggs until they hatch as tiny fully formed seahorses. ll vertebrates have a back
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  Seahorses are an unusual type of sh with a head that looks like a horse's head. They do not have scales and they swim in an upright position. They arevery slow swimmers, but they can quickly change colour, which provides camouage to protect them fom predators.hat makes seahorses truly unique is their way of reproducing. !ale seahorses have a pouch where the females deposit the eggs. The males then carry the eggs until they hatch as tiny fully formed seahorses.ll vertebrates have a backbone made up of ring like bones called vertebrae, and an internal skeleton called an endoskeleton. #ertebrates aer classied into ve groups$ mammals, birds, reptiles, amphibians and sh.!ammals are viviparous, and the females produce milk to feed their young.  They are warm blooded, which means they maintain a constant body temperature. !ost mammals have fur or hair on their bodies. !ammals breathe with lung. !ost mammals have four legs and most have teeth. !ost mammals are terrestrial, but a few are aquatic, for e%ample, sea lions and dolphins. BIRDS &irds are oviparous and take care of their young. ike mammals, they are warm blooded, but they have a beak instead of teeth. Their bodies are covered with feathers. &irds breathe with lungs. They have two legs, a tail and two wings. (owever, some birds cannot y, for e%ample, penguins. REPTILES )eptiles are oviparous. They are cold blooded, which means their body temperature varies with the temperature of their surroundings. Their skin is thick and covered with scales. )eptiles breathe with lungs. !ost reptiles have teeth. !ost reptiles have four legs, but snakes do not have legs. AMPHIBIANS *mphibians are cold blooded, oviparous animals. Their bodies are covered with bare skin. hen they are young, they breathe through gills. *dult amphibians breathe with lungs. !ost amphibians have teeth and a sticky tongue. *dult amphibians have four legs. FISH  +ish are cold blooded, oviparous animals. Their bodies are covered with scales. They breathe through gills. They have ns and a tail. Some sh have teeth. Sharks have several rows of teeth. INVERTEBRATES nvertebrates do not have a backbone. They are cold blooded. !ost invertebrates are oviparous. nvertebrates are classied into sponges, cnidarians, worms, echinoderms, molluscs and arthropods. Sponges Sponges are very simple invertebrates. They live attached to surfaces beneath the sea. They lter sea water through tiny holes to obtain food.  There are many di-erent types of sponges. Cnidarians nidarians have soft bodies with poisonous tentacles to catch their prey. Some cnidarians can move about, others are attached to surfaces beneath the sea. /elly sh, sea anemones and coral are cnidarians. Worms orms have long, soft bodies which can be cylindrical or at. orms do not have legs. Some worms are terrestrial and some are aquatic. There bod par!s head# !hora$ and abdoE%hinoderms 0chinoderms are marine animals. They have hard endoskeletons. 0chinoderms have radical symmetry. !any echinoderms have spines. They move very slowly along the sea bed. Mo&&'s%s *ll molluscs have soft bodies. 1ctopuses and slugs are molluscs. !any molluscs have a hard e%ternal shell, for e%ample, mussels, clams and snails. !ost molluscs live in the sea, but some snails and slugs live on land. ANTR(P(DS *rthropods are the most abundant animals on 0arth. They have a hard e%oskeleton, 2ointed legs and a segmented body. *rthropods can be classiedinto four groups.  Inse%!s ) &egs !ain characteristics$ Three body parts$ head, thora% and abdomen.1ne pair of antennae.!any insects have wings.&utteries, grasshoppers, beetles, ladybirds, bees and ants are insects. Ara%hnids * &egs !ain characteristics$ Two body parts$ cephalothora% and abdomen.Spiders and scorpions are arachnids. Cr's!a%eans +, !o +- &egs !ain characteristics$ !ost have two body parts$ cephalothora% and abdomen. Two pairs of antennae.obsters, prawns and crabs are crustaceans. Mriapods more !han ., &egs !ain characteristics$ Two body parts$ head and long, segmented trunk with many legs.1ne pair of antennae.entipedes and millipedes are myriapods.
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