What characteristic defines the Phylum Arthropoda for *Cheiracanthium*?
Answer
Exoskeleton and segmented body
The Phylum Arthropoda, which includes the Yellow Sac Spider, is fundamentally characterized by possessing an exoskeleton, a body composed of distinct segments, and the presence of jointed appendages. These three specific physical traits are crucial for classification within this vast phylum, setting them apart from other animal groups such as annelids (segmented worms without exoskeletons) or vertebrates which possess internal bony skeletons.
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