Multiple Choice
Which of the following is the best evidence for a three-domain system in biological classification?
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1. Introduction to Biology
Introduction to Taxonomy
Multiple Choice
Which of the following correctly distinguishes between Ornithischians and Saurischians in dinosaur taxonomy?
A
Ornithischians have a bird-like pelvis, while Saurischians have a lizard-like pelvis.
B
Both Ornithischians and Saurischians have identical pelvic structures.
C
Ornithischians include modern birds, while Saurischians do not.
D
Saurischians are exclusively herbivorous, while Ornithischians are exclusively carnivorous.
Verified step by step guidance1
Step 1: Begin by understanding the taxonomy of dinosaurs. Dinosaurs are divided into two major groups based on the structure of their pelvis: Ornithischians and Saurischians.
Step 2: Examine the defining characteristic of Ornithischians. Ornithischians are known for having a bird-like pelvis, where the pubis bone points backward, parallel to the ischium.
Step 3: Examine the defining characteristic of Saurischians. Saurischians have a lizard-like pelvis, where the pubis bone points forward, away from the ischium.
Step 4: Clarify the distinction between these groups. Ornithischians are herbivorous dinosaurs, while Saurischians include both herbivorous and carnivorous dinosaurs. Modern birds evolved from a subgroup of Saurischians called theropods.
Step 5: Evaluate the options provided in the question. Use the information about pelvic structure and evolutionary lineage to identify the correct distinction between Ornithischians and Saurischians.
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