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Arizona State University *

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201

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Biology

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May 11, 2024

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pdf

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5

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5/8/24, 9:09 AM Lesson Activity: Robber Crabs Lesson Activity Robber Crabs This activity will help you meet these educational goals: « You will apply scientific principles to explain phenomena and solve design problems. « You will reason abstractly and quantitatively. « You will make sense of problems and work to solve them. Directions Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a brief evaluation of your work. Activity Watch this video about robber crabs, and then answer the following questions. Part A What type of invertebrate are robber crabs? Why do these crabs fit in this category? Use evidence from the video in your answer. Answer: Arachnopods are robber crabs. They have jointed body segments and hard exoskeletons in the video. It is evident that they are heterotrophs, a trait shared by animals. Space used (includes formatting): 173 / 15000 Show Sample Answer https://f1.app.edmentum.com/courseware-delivery/ua/715796/45449356/aHROcHM6LY9IMMS5hcHAUZWRIZW50dWO0uY29tL2x0aS92Mi9sZWFybmV... 1/5
5/8/24, 9:09 AM Lesson Activity: Robber Crabs Part B An adaptation is a behavior or a physical characteristic that allows an organism to survive in its environment. What adaptations do robber crabs have? Answer: Robber crabs are protected by powerful pincers. Their pincers are also used for feeding and climbing. Their bodies are further shielded by their exoskeleton and massive size. Till they are big enough to protect themselves, the juvenile crabs cling to shells. Crabs can live long lives because they require less energy when they reach a certain size because they move more slowly. Space used (includes formatting): 386 / 15000 Show Sample Answer Part C Look at the phylogenetic tree. Do robber crabs have more in common with humans or with sponges? What conclusion can you reach about their evolution? https://f1.app.edmentum.com/courseware-delivery/ua/715796/45449356/aHROcHM6LY9mMMS5hcHAUZWRIZW50dWO0uY29tL2x0aS92Mi9sZWFybmV... 2/5
5/8/24, 9:09 AM Lesson Activity: Robber Crabs W\ \ cnidaria " nematoda annelida platyhelminthes porifera mollusca worms spid ‘multicellularity Answer: Since both robber crabs and humans are vertebrates, they have more in common. Simple organisms without tissues are sponges. Humans and crabs share a coelom, bilateral symmetry, and specialized cells and tissues. Vertebrates and arthropods have more nodes, or common ancestors, than crabs have with sponges, according to the phylogenetic tree. Space used (includes formatting): 349 / 15000 Show Sample Answer https://f1.app.edmentum.com/courseware-delivery/ua/715796/45449356/aHROCHM6LY9MMSS5hcHAUZWRIZW50dWO0uY29tL2x0aS92Mi9sZWFybmV... 3/5
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