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Multiple Choice
What distinguishes a coelomate animal from a pseudocoelomate animal?
A
Pseudocoelomate animals have a coelom partially lined with endodermal tissue.
B
Pseudocoelomate animals have a coelom completely lined with ectodermal tissue.
C
Coelomate animals lack a body cavity.
D
Coelomate animals have a true coelom completely lined with mesodermal tissue.
Verified step by step guidance
1
Understand the concept of a coelom: A coelom is a fluid-filled body cavity that is completely lined with mesodermal tissue. It provides space for the development and suspension of organs and contributes to the complexity of an organism's body structure.
Differentiate between coelomate and pseudocoelomate animals: Coelomate animals have a true coelom, which means their body cavity is completely lined with mesodermal tissue. Pseudocoelomate animals have a body cavity that is not completely lined with mesodermal tissue; instead, it is partially lined with endodermal tissue.
Identify the incorrect statements: The statement 'Pseudocoelomate animals have a coelom completely lined with ectodermal tissue' is incorrect because the lining is not complete and involves endodermal tissue. The statement 'Coelomate animals lack a body cavity' is incorrect because coelomate animals do have a true coelom.
Recognize the correct statement: The correct statement is 'Coelomate animals have a true coelom completely lined with mesodermal tissue.' This distinguishes them from pseudocoelomate animals, which have a partially lined body cavity.
Summarize the distinction: Coelomate animals have a fully lined coelom with mesodermal tissue, allowing for more complex organ development and body structure, while pseudocoelomate animals have a partially lined body cavity, limiting the complexity of their body structure.