Which of the following is a vertebrate?
A: crabNo. Crabs have an exoskeleton. They are arthropods, which are invertebrates.
B: starfishNo. Starfish do not have a vertebral column or a notochord. They are echinoderms, which are invertebrates.
C: flyNo. Flies have an exoskeleton. They are insects, which are invertebrates.
D: tadpoleYes! Tadpoles are amphibians. They have an internal skeleton, which includes a vertebral column. They are vertebrates.
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SC.3.L.15.1 Classify animals into major groups (mammals, birds, reptiles, amphibians, fish, arthropods, vertebrates and invertebrates, those having live births and those which lay eggs) according to their physical characteristics and behaviors.
SC.6.L.15.1 Analyze and describe how and why organisms are classified according to shared characteristics with emphasis on the Linnaean system combined with the concept of Domains.
UT.4.V.3.b Use a simple classification system to classify unfamiliar Utah plants or animals (e.g., fish/amphibians/reptile/bird/mammal, invertebrate/vertebrate, tree/shrub/grass, deciduous/conifers).