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Q: Which of the following statements is true about the animals of the phylum chordata?
  • A. They lack a post - anal tail
  • B. They have a dorsal nerve cord
  • C. They have a solid bilateral nerve cord
  • D. They have a heart that is dorsal or lateral or absent
Correct Answer: Option B - Chordates are animals that have four distinctive features at some stage of their life cycle : a notochord a dorsal nerve cord, pharyngeal slits , and a post-anal tail. The dorsal nerve cord is a hollow tube of nervous tissue that runs along the back of the body and connects the brain to the rest of the body.
B. Chordates are animals that have four distinctive features at some stage of their life cycle : a notochord a dorsal nerve cord, pharyngeal slits , and a post-anal tail. The dorsal nerve cord is a hollow tube of nervous tissue that runs along the back of the body and connects the brain to the rest of the body.

Explanations:

Chordates are animals that have four distinctive features at some stage of their life cycle : a notochord a dorsal nerve cord, pharyngeal slits , and a post-anal tail. The dorsal nerve cord is a hollow tube of nervous tissue that runs along the back of the body and connects the brain to the rest of the body.