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page 43 of 100
question 43
the most successful animal group is the:
a echinoderm group.
b nematode group.
c chordate group.
d arthropod group.
e mollusk group.
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Explanation:

Arthropods are the most successful animal group due to their high species diversity, wide ecological distribution, and adaptability (e.g., exoskeleton, jointed appendages, metamorphosis). Echinoderms, nematodes, chordates, and mollusks have fewer species and less ecological dominance compared to arthropods.

Answer:

D. arthropod group.