Question

1. what are chordates?

Explanation:

Chordates are a phylum of animals. They are defined by having certain key characteristics at some stage of their development: a notochord (a flexible rod - like structure), a dorsal hollow nerve cord, pharyngeal slits (or pouches), and a post - anal tail. This group includes vertebrates (like mammals, birds, reptiles, amphibians, and fish) as well as some invertebrate species such as tunicates and lancelets.

Answer:

Chordates are a phylum of animals characterized by possessing a notochord, dorsal hollow nerve cord, pharyngeal slits (or pouches), and a post - anal tail at some stage of development. They include vertebrates (e.g., mammals, birds, fish) and some invertebrates (e.g., tunicates, lancelets).