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Questions and Answers
What marks the earliest fossil appearance of all major groups of living animals plus some groups that are only known from fossils?
What marks the earliest fossil appearance of all major groups of living animals plus some groups that are only known from fossils?
- Cretaceous period
- Devonian period
- Cambrian explosion (correct)
- Jurassic period
What is a group of animal species that share the same level of organizational complexity known as?
What is a group of animal species that share the same level of organizational complexity known as?
- Class
- Family
- Order
- Grade (correct)
What are the grades of organization based on general features of morphology and development?
What are the grades of organization based on general features of morphology and development?
- Body plans (correct)
- Segmentation
- Symmetry
- Cephalization
What are the major body plans known to have appeared during the Cambrian explosion?
What are the major body plans known to have appeared during the Cambrian explosion?
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What characterizes a protoplasmic grade of organization?
What characterizes a protoplasmic grade of organization?
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