Multiple Choice
Which two animal groups are classified as ecdysozoans?
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31. Invertebrates
Ecdysozoans
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In arthropods, molting is necessary because __________.
A
arthropod appendages generally increase in number as the animal ages
B
the environment degrades the exoskeleton, which therefore must be shed and replaced
C
worn exoskeletons make arthropods more susceptible to predators
D
the exoskeleton is progressively reabsorbed by body tissue
E
the chitinous exoskeleton cannot grow
Verified step by step guidance1
Understand that arthropods, such as insects, crustaceans, and arachnids, have an exoskeleton made of chitin, which provides structural support and protection.
Recognize that the exoskeleton is rigid and does not expand as the arthropod grows, unlike the flexible skin of vertebrates.
Identify that because the exoskeleton cannot grow, arthropods must periodically shed their old exoskeleton in a process called molting or ecdysis.
During molting, the arthropod forms a new, larger exoskeleton underneath the old one. Once the old exoskeleton is shed, the new exoskeleton hardens and provides room for growth.
Conclude that molting is necessary for arthropods to grow because their chitinous exoskeleton cannot expand, necessitating the shedding and replacement of the exoskeleton to accommodate their increasing body size.
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