Part A
The animal phylum most like the protists that gave rise to the animal kingdom is _____. - Porifera
Correct: Evidence that supports this includes the lack of true tissue in sponges and the close similarity between choanocytes and choanoflagellates.
Part A
Which of the following is a c...
D&E Biology Chapter 33 quizzes and answers Part A The animal phylum most like the protists that gave rise to the animal kingdom is _____. - Porifera Correct: Evidence that supports this includes the lack of true tissue in sponges and the close similarity between choanocytes and choanoflagellates. Part A Which of the following is a characteristic of cnidarians? - gastrovascular cavity Correct: The gastrovascular cavity, characterized by a single opening, is the digestive compartment of cnidarians. Part A Which of the following is a hypothesis the researchers were testing in this study? - Through evolution, periwinkle populations with a history of predation by crabs have become less vulnerable to crab predation. Correct: The researchers' hypothesis was that southern periwinkle populations with a history of predation by crabs have become less vulnerable to crab predation through evolution. Part B Identify an independent variable in this experiment. - the source of the periwinkles (northern or southern sites in the Gulf of Maine) Correct: One of the independent variables was the source of the periwinkle population --northern or southern sites in the Gulf of Maine. The source of the crab population was also an independent variable. Part C Identify the dependent variable in this experiment. - the number of periwinkles killed by crabs Correct: The dependent variable was the number of northern and southern periwinkles killed by crabs. Part D 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 Part E 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 Correct: The researchers wanted to rule out the possibility that northern crabs didn't like the taste of southern periwinkles or that southern crabs didn't like the taste of northern periwinkles. This experiment allowed researchers to conclude that differe nces in numbers of southern and northern periwinkles killed were due to differing vulnerability to crab predation, not due to crab preferences. Part F
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