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After its old exoskeleton has been shed ...

After its old exoskeleton has been shed but before the new one has hardened, an aquatic arthropod absorbs water and swells. How is this behaviour adaptive?

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**Step-by-Step Solution:** 1. **Understanding Exoskeletons**: Arthropods possess an exoskeleton, which is a hard outer structure that provides protection and support. This exoskeleton is made of chitin and is inflexible. 2. **Molting Process**: To grow, arthropods must undergo a process called molting (ecdysis), where they shed their old exoskeleton. This allows them to increase in size since the old exoskeleton restricts growth. 3. **Timing of Water Absorption**: After the old exoskeleton is shed, but before the new one hardens, the aquatic arthropod absorbs water. This is a critical phase where the new exoskeleton is still soft and pliable. ...
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