### animal | chick:

Puffin chick
* Some puffin chicks leave colonies.
* leave a colony when they fledge and head off to the ocean without their parents.

Young chick
* Most young chicks have bills.
* Some young chicks eat insects.

### animal:

Chordate
* All chordates also have a ventral heart.
* All chordates are vertebrates, they differ from tunicates and lancelets in two ways
* All chordates have a dorsal hollow nerve tube, a notochord, and pharyngeal gill slits
  - hollow nerve cord, a notochord, and pharyngeal slits
* All chordates have a notochord and dorsally-situated nerve chord
  - that is present during some or all of their life cycle
  - jaws
  - notochords
* Many chordates reproduce through asexual budding, although lancelets have distinct sexes.
* Most chordates are vertebrates
  - have a muscular tail extending posterior to the anus
* Most chordates have a tail extending beyond the anus
  - an internal skeleton made of bone, cartilage, or both
* Some chordates also have an external shell
  - are invertebrates
  - have a week circulotary system
* also have bilateral symmetry.
* are animals.
* are characterized by a notochord
  - having a nerve cord running along the length of the back
  - eucoelomate deuterostomes, and probably share a common ancestor with echinoderms
  - less numerous than crustaceans
  - organisms with a stiffening rod along one side
  - the phylum which contains the sub-phylum Vertebrata
  - usually long and narrow, with a stiffening rod of cartilage running along the back
* embody many sophisticated evolutionary adaptations.
* exhibit bilateral symmetry and have an endoskeleton for support.
* have a backbone
  - an unsegmented body
  - four shared derived characters
* is an animal
* retain structural plans characteristic of non-chordate invertebrates.

### animal | chordate:

Ascidian
* Many ascidians form colonies.
* Most ascidians are inconspicuous and are often covered by smaller sessile animals.
* are an important food source for some nudibranchs
  - filter feeders
  - hermaphroditic
  - simultaneous hermaphrodites and the gonoducts open into the atrium
  - tunicates
* can reproduce both sexually and asexually.
* filter sea water into a double layered envelope.
* have a living, external, cellular exoskeleton, or tunic, underlain by the epidermis
  - no structure recognizable as a kidney
* live exclusively in marine habitats, and most families are represented at all latitudes.
* produce tadpole larvae with a visible notochord.

### animal | chordate | ascidian:

Sea squirt
* Many sea squirts reproduce by budding as well as by sexual means.
* Most sea squirts live underwater, typically anchored to rocks on the bottom.
* are ascidians
  - familiar examples of large solitary ascidians
  - just one kind of Urochordate
  - the best known tunicates
  - very similar to sponges in appearance
* can live in colonies and share siphons that expel water and wastes.
* common name for.
* distinguish self from non-self in much the same way.
* have transparent or translucent tunics made of cellulose.
* is an ascidian
* possess both sex organs, but are unable physiologically to self-fertilize.

Larvacean
* Most larvaceans are hermaphrodites.
* are primitive chordates related to tunicates
* form mucus nets to collect tiny planktonic food particles.
* rebuild their house every day.

Salp
* are adapted for a free-swimming, planktonic existence
  - arguably the most primitive living chordates
  - important for what they eat and excrete
  - minute tunicates that live as plankton
* belong to a group of marine chordates commonly known as tunicates.
* literally starve to death because they are in the midst of plenty.
* reproduce both sexually and by budding.