What fundamental traits define membership in the Phylum Arthropoda, to which *E. sarcitrella* belongs?
Answer
An exoskeleton, a segmented body, and jointed appendages.
The Phylum Arthropoda is characterized by a specific set of physical attributes that provide support and facilitate movement. A key feature is the hard, external casing known as the exoskeleton, which must be periodically shed for growth. Additionally, their bodies are divided into distinct sections or segments, and they utilize jointed limbs—such as legs and antennae—for interaction with their environment. These characteristics clearly place insects, including this moth, within this immense phylum, differentiating them from worms or mollusks.
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