32. Vertebrates

Which of the following is NOT one of the five key characteristics of chordates?

Vertebrates are distinguished by the possession of which of the following structures?

Which characteristic is absent in tunicates and lancelets but is present in vertebrates?

Which of the following is NOT a diagnostic feature of the phylum Chordata?

Which of the following is a characteristic of all chordates at some point during their life cycle?

A feature of bony fish not found in sharks is __________.

Which of the following is among the earliest known vertebrates?

Which of the following chordate characteristics contributes most to suspension-feeding devices in many invertebrate chordates?

Which of the following pairs is not a correct match?

Some sharks are viviparous, which means that __________.

Which of the following can be found in vertebrates but not in lancelets and tunicates?

Habitat loss, the spread of a fungal disease, climate change, and pollution are causing severe population declines and extinction in __________.

The operculum was an important adaptation for fish because it helps with __________.

Which of the following organisms is most closely related to the ancestor of modern amphibians?

Which of the following sets of animals contains only gnathostomes?