Question

chordates are animals with four main features: a notochord, a nerve cord, a post - anal tail, and pharyngeal slits. some keep these features for their whole lives, while others lose them as they grow. chordates include groups like sea squirts, lancelets, and vertebrates (like humans and fish). they are important for ecosystems, providing food, balancing the environment, and helping us understand the health of our planet. which of these is not a feature of chordates? notochord, pharyngeal slits, exoskeleton

Explanation:

Chordates are defined by having a notochord, pharyngeal slits, and a post - anal tail at some stage of their development. An exoskeleton is not a characteristic feature of chordates. Exoskeletons are common in arthropods like insects and crustaceans.

Answer:

C. Exoskeleton