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Invertebrate Digestive Systems
Most invertebrates have a mouth through which they consume food and an anus through which wastes are removed. In some animals, the same structure serves as both mouth and anus. These structures are part of the digestive system.
Color the digestive system in each organism blue. Then label the mouth and anus on each diagram.
Cnidarian
Annelid
Arthropod
Use the diagrams to answer the question.
1. Which organism has a digestive system with only one opening?
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Invertebrate Respiratory Systems
Invertebrates have a variety of respiratory systems. Aquatic invertebrates may have gills to obtain oxygen from water. Land invertebrates may use structures including book lungs and tracheal tubes to obtain oxygen from the air.
Color the respiratory system in each organism red. Then use the words below to label the structures in each organism.
book lunggilltracheal tubesspiracles
Mollusk
Spider
Insect
Answer the questions.
2. What are spiracles?
1. What can you conclude about a mollusk that uses gills for respiration?
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Invertebrate Circulatory Systems
In an open circulatory system, the hearts or heartlike organs pump blood into cavities called sinuses. The blood contacts tissues directly and eventually returns to the heart. In a closed circulatory system, the hearts or heartlike organs pump blood through vessels.
Color the circulatory system in each organism red. Label the hearts and blood vessels in the grasshopper and the heartlike structures and blood vessels in the earthworm.
Grasshopper
Earthworm
Use the diagrams to answer the questions. Circle the correct answer. 1. What kind of circulatory system does the grasshopper have?
closedopen
2. What kind of circulatory system does the earthworm have?
closedopen
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Invertebrate Excretory Systems
The excretory system in animals removes wastes from the body. Invertebrates have evolved different structures, such as flame cells, Malpighian tubules, and nephridia, to accomplish this task.
Color the excretory structures in each organism blue. Then label the flame cells, Malpighian tubules, and nephridia.
Flatworm
Annelid
Arthropod
Use the diagrams to answer the questions.
1. Which organism uses nephridia to remove wastes?
2. Explain how flame cells are used.
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Invertebrate Nervous Systems
The nervous system controls an animal’s response to its environment. Many animals have a brain or groups of nerve cells called ganglia that control the nervous system.
Label the nervous system structures in the following invertebrates. Choose from the following labels: nerve cells, brain, and ganglia. Some words may be used more than once.
Cnidarian
Arthropod
Flatworm
Use the diagrams to answer the question.
1. Which organism shows cephalization? Circle the correct answer.
molluskcnidarian
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