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Published byChad Barnett Modified over 9 years ago
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9.Octopus and Starfish 1
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An octopus is a mollusk that has no shell at all 2 It looks as if it is all head and arms
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An octopus has eight (8) arms, called tentacles, which have many suckers on them 3
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Suckers hold on tightly to objects they touch 4 The suckers help an octopus to crawl and to hold on to its food
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An octopus moves by pulling itself along by its tentacles 5 It can also use a kind of jet propulsion to move
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It pulls in water through its gills and sends it out very fast through a tube under its head 6 The force of the water moves the octopus backward
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One way that an octopus can find food is by hiding among stones and seashells on the ocean floor 7 The octopus can change its color to match its surroundings
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Small water animals that swim by usually do not see the octopus 8 The octopus can grab an animal with its tentacles
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Most kinds of octopuses are as small as a person’s fist 9 How do they escape bigger animals that feed on them?
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An octopus can squirt out a liquid, like ink, that blackens the water 10 The octopus then swims away
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Giant octopuses that live in the Pacific Ocean have few enemies to swim away from 11 These octopuses can grow to be 30 feet long
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Starfish live in all oceans 12 Fish is part of their name, but they are not fish but invertebrates
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Starfish have a small central body, with a mouth on the bottom side 13 Most starfish have five arms that stick out from their bodies
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Other kinds have more than 25 arms 14 Stiff spines cover their bodies and arms
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Starfish are often dull yellow or orange but can be bright colors, too 15 They can be as small as ½ inch and as big as 3 feet wide
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Starfish use their tube feet to move 16 These small tube feet are under each arm
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Suction cups are attached to the feet 17 Suction cups help starfish to move
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Starfish eat animals, especially like clams and other mollusks 18 A starfish catches a clam with its arms
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The clam closes its shell to protect itself 19 Using its tube feet, the starfish forces the shell open a little bit
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Then the starfish turns its stomach inside out and pushes it out of its mouth 20 It sticks its stomach into the opened clamshell and eats the soft clam body
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Then the starfish pulls its stomach out of the clam 21 and puts it back into its own body
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A starfish can grow new arms if its arms are broken off 22 This is called regeneration
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In fact, if a starfish loses all its arms but one and most of its central body 23 a new body and new arms will grow
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Starfish eat mollusks like clams and oysters that are valuable crops for fishermen 24 The fishermen may try to destroy starfish by cutting them into pieces
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But the pieces grow into even more starfish! 25
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