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Ocean Invertebrates

Life Science - Middle School

 
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Invertebrates are animals that have no backbone. The Animal Kingdom is broken down into groups called Phyla and all, except one, are invertebrates. Of the many invertebrate phyla, some are adapted for life in the ocean. These are called marine invertebrates. Each group of marine invertebrates has their own unique adaptations to survive ocean life. One group is made up of sponges (1) (porifera). As adults, sponges attach themselves to the ocean floor where they live on small bits of food brought to them by wave action. Another group of marine invertebrates (mollusca) includes oysters, clams (5) and mussels (6) (bivalves). They are called bivalves because they are protected by a two-sided, hinged shell kept closed by a strong muscle. Another group includes starfish (2), sea urchins (3) and sand dollars (4) (echinodermata). Starfish are slow but powerful predators. They work the shell of a mussel open and expel their stomachs out of their mouths and into the mussel where they digest them. Sea slugs (7) and snails are in another group (gastropods). Sea slugs are not like their terrestrial cousins. They come in many shapes with stunning colors and patterns. Squid (8) and octopuses (9) (cephalopods) use camouflage and jets of water to escape predators and have a sharp beak to stab prey. Jellyfish (10), coral (11) and sea anemones (12) (cnidaria) make up another group that uses poison stinging cells to stun their prey. Crabs (13), shrimp (14) and lobsters (15) (malacostraca) have a protective outer shell and powerful pinching claws. They are related to the barnacles (16) (maxillopoda) that are adapted for life in and out of the water as the tide rises and falls, and horseshoe crabs (17) (merostomata) that have survived in their niche for many thousands of years. 4 1 3 5 8 9 6 7 10 11 13 12 17 15 14 2 16 Amsel Ocean Invertebrates
94-4068 Invertebrates are animals that have no ____________________________. The Animal Kingdom is broken down into groups called Phyla and all, except one, are invertebrates. Of the many invertebrate phyla, some are adapted for life in the ocean. These are called marine invertebrates. Each group of marine invertebrates has their own unique adaptations to survive ocean life. One group is made up of sponges (1). As adults, sponges attach themselves to the ocean floor where they live on small bits of food brought to them by _______________________ action. Another group of marine invertebrates includes oysters, _________________ (5) and ____________________ (6). They are called bivalves because they are protected by a two- sided, ______________________ shell kept closed by a strong muscle. Another group includes _____________________ (2), sea urchins (3) and sand dollars (4). Starfish are slow but powerful predators. They work the shell of a mussel open and expel their _______________________ out of their mouths and into the mussel where they digest them. Sea slugs (7) and snails are in another group. Sea slugs are not like their terrestrial cousins. They come in many shapes with stunning colors and patterns. Squid (8) and __________________________ (9) use camouflage and jets of _______________________ to escape predators and have a sharp _______________________ to stab prey. Jellyfish (10), _______________ (11) and sea anemones (12) make up another group that uses poison _______________________ cells to stun their prey. Crabs (13), ______________________ (14) and ____________________ (15) have a protective outer _______________________ and powerful pinching _______________________. They are related to the ___________________ (16), that are adapted for life in and out of the water as the tide rises and falls, and horseshoe crabs (17) that have survived in their niche for many thousands of years. Amsel 4 1 3 5 8 9 6 7 10 11 13 12 17 15 14 2 16 Ocean Invertebrates
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