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What is the definition of an Arthropod?
Vertebrate animal
Mollusk
Invertebrate animal with jointed body and limbs
Amphibian with fins
The correct answer is: Invertebrate animal with jointed body and limbs
An Arthropod is an invertebrate animal with a jointed body and limbs. This means that it does not have a spinal column or backbone like vertebrate animals do. Option A is incorrect because while vertebrate animals do have a spinal column, they do not have a jointed body and limbs like arthropods. Option B is incorrect because mollusks do not have a jointed body and limbs, they have a soft body and may have a hard shell. Option D is incorrect because amphibians do not have jointed body and limbs, they have fins for swimming.