The major difference between the two divisions of annelids, the errantians and sedentarians, is that
  • They are the most diverse phylum.
  • changing how water is released from dams
  • Porifera—gastrovascular cavity, coelomate
  • sedentarians are less mobile than errantians
Which of the following statements about molluscs is incorrect?
  • Crabs are more successful in preying on northern periwinkles.
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
  • They are the most diverse phylum.
  • Porifera—gastrovascular cavity, coelomate
Why did the researchers present unshelled northern and southern periwinkles to northern and southern crabs in the second experiment?
  • to test if either population of periwinkles was unpalatable to either population of crabs
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
  • to test whether the origin (northern site or southern site) of the crabs and periwinkles affected their interactions
  • Southern populations of flat periwinkles have accumulated traits that make them less vulnerable than northern populations to predation by European green crabs.
Based on the results shown in the graph, how has natural selection affected populations of flat periwinkles in the southern Gulf of Maine over the last century?
  • Through evolution, periwinkle populations with a history of predation by crabs have become less vulnerable to crab predation.
  • to test if either population of periwinkles was unpalatable to either population of crabs
  • Southern populations of flat periwinkles have accumulated traits that make them less vulnerable than northern populations to predation by European green crabs.
  • Most arthropod sensory organs are concentrated at the posterior end
Which of the following phyla have a water vascular system?
  • echinoderms
  • ophiuroidea
  • mesophyll
  • They are the most diverse phylum.
Which of the following pairings of phylum and description is incorrect?
  • They are the most diverse phylum.
  • Most arthropod sensory organs are concentrated at the posterior end
  • Crabs are more successful in preying on northern periwinkles.
  • Porifera—gastrovascular cavity, coelomate
Which of the following statements about nematode (or round) worms is incorrect?
  • Crabs are more successful in preying on northern periwinkles.
  • Most arthropod sensory organs are concentrated at the posterior end
  • Trichinella spiralishas become a model research organism in biology.
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
How was repeatability demonstrated in this experiment?
  • Most arthropod sensory organs are concentrated at the posterior end
  • Crabs are more successful in preying on northern periwinkles.
  • For each treatment, 12-14 crabs were offered a selection of periwinkles.
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
Which of the following best summarizes the results shown in the graph?
  • Most arthropod sensory organs are concentrated at the posterior end
  • They are the most diverse phylum.
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
  • Crabs are more successful in preying on northern periwinkles.
Why did the researchers set up four treatments?
  • to test whether the origin (northern site or southern site) of the crabs and periwinkles affected their interactions
  • to test if either population of periwinkles was unpalatable to either population of crabs
  • Through evolution, periwinkle populations with a history of predation by crabs have become less vulnerable to crab predation.
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
Which of the following is the dependent variable in this experiment?
  • They are the most diverse phylum.
  • the number of periwinkles killed by crabs
  • the source of the periwinkles (northern or southern sites in the Gulf of Maine)
  • Porifera—gastrovascular cavity, coelomate
All of the following are threats faced by freshwater and terrestrial molluscs except
  • changing how water is released from dams
  • They are the most diverse phylum.
  • Crabs are more successful in preying on northern periwinkles.
  • Porifera—gastrovascular cavity, coelomate
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