Multiple Choice
Which of the following groups represents the most basal lineage of vertebrates?
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1. Introduction to Biology
Introduction to Taxonomy
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Among the invertebrate phyla, phylum Arthropoda is unique in possessing members that have:
A
a mantle and muscular foot
B
jointed appendages and a segmented exoskeleton
C
a water vascular system
D
radial symmetry as adults
Verified step by step guidance1
Step 1: Begin by identifying the key characteristics of phylum Arthropoda. Arthropods are known for their jointed appendages and segmented exoskeleton, which are unique features that distinguish them from other invertebrate phyla.
Step 2: Compare the given options to the defining traits of Arthropoda. For example, a mantle and muscular foot are characteristics of mollusks, not arthropods.
Step 3: Evaluate the option 'a water vascular system.' This is a feature of echinoderms, such as sea stars, and is not found in arthropods.
Step 4: Assess the option 'radial symmetry as adults.' Radial symmetry is typical of echinoderms, whereas arthropods exhibit bilateral symmetry.
Step 5: Conclude that the correct answer is 'jointed appendages and a segmented exoskeleton,' as these are defining features of phylum Arthropoda.
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