Biology 103Chordates (Extra
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1. Applying the information from the “overview” module
describe the chordates according to these six features:
c. digestive system
d. body cavity
2. Name the four distinguishing characteristics of all chordates.
3. Lancelets do not reproduce .
Many tunicates do reproduce asexually by
. Many tunicates are
and fertilization is . Lancelets are
gonochoristic and fertilization is .
4. Both lancelets and tunicates seem to rely on for
gas exchange. Although lancelets are heartless, tunicates have short
hearts that seem to have very little to
do with .
5 . Both lancelets and tunicates gain nutrition from their environment by .
6. Name the two phyla of chordates presented in this module, list the number
of species in each group, and describe the distinguishing features of each. .
1. Fish and amphibians do not reproduce,
for the most part, although there area very few species in which the females can
reproduce . Most fish and amphibians
rely on fertilization.
2. Fish, larval amphibians and some adult amphibians have highly efficient .
Active organisms require an efficient gas exchange system and an efficient
3. All adult amphibians are . Most
fish are feeders. Amphibians and
fish have complex digestive
system. In almost all vertebrates there is adistinct division called the
4. Name the four classes of aquatic vertebrate chordates presented in this
program, list the number of species in each group, and describe the features
that distinguish them.
1. reproduction with
fertilization is, by far, the rule with terrestrial chordates. All jawed
vertebrates have specilaized structures for the transport of
Offspring are produced by the hatching of of by live
of miniature adult forms
have the simplest respiratory system of the land vertebrates, more divided than
but less than
. Reptiles and mammals have lungs, organs that terminate
in dead-end vessel rich sacs called
where gas exchange takes place.
3. The muscular diaphragm of mammals separates the
into a cavity and an
have the most complex and efficient respiratory system.
4. Almost all reptiles are
but there are a few herbivorous among the
and . Birds and mammals include species that subsist on a
variety of food sources. Reptiles and birds tend to swallow their food
, while most mammals use their highly specialized teeth to
their food before swallowing it.
5. Name the three classes of terrestrial vertebrate chordates presented in this program,
list the number of species in each group, and describe the features that make them unique.