chapter 32 Flashcards
which of the following is NOT a unique characteristic of all chordates at some time in their life history?
radial symmetry
defining characteristics of chordates are
gill arches or pharyngeal pouches, dorsal tubular nerve cord, notochord, and postanal tail
which of the following sequences correctly represents vertebrate evolution?
jawless fish - lobe-finned fish - amphibians - reptiles - mammals
in vertebrates, the ___ is/are usually replaced by ___
notochord; a vertebral column
which represents the correct order of evolution of chordate features?
vertebrae - jaws - lungs - limbs - amnion
what is the correct evolutionary pathway for the key features of chordates?
notochord - vertebrae - jaws - bony skeleton - lungs - 4 limbs - amniotic egg - mammary glands
jaws are believed to have evolved from the
first pair of gill arches
the lancelets are found
commonly in the sandy bottoms of shallow coastal waters around the world
which of these is NOT a characteristic of a shark?
a sucker used to attach to prey
sharks
have a keen sense of smell
of the following, the most recent ancestor of amphibians would be
coelacanth
which of these characteristics is NOT found in the amphibians but it is developed in reptiles?
internal fertilization
which of these characteristics first developed in reptiles?
amniotic egg
which of the following features was NOT necessary or adaptation by reptiles of life on land?
being cold-blooded
mammals are different from birds in all these characteristics EXCEPT
maintaining a constant body temperature
which of the following features is NOT a characteristic used to distinguish birds?
body temperature that varies with environment
an animal that is characterized by vertebrae, dorsal hollow nerve cord, hair, and mammary glands must be a
mammal
the chief distinguishing characteristic of all mammals is the presence of
hair and mammary glands
all mammals have an embryo that develops with a placenta
false
tiktaalik roseae is considered to be a transitional form between
lobe-finned fish and amphibians
the juvenile amphibian generally hatches from an egg and develops
in water
primates have characteristics like opposable thumbs and toes, arms that can reach in almost any direction, and stereoscopic vision with eyes at the front of the face rather than sides of the head. this characteristics are thought to be well adapted to life
in trees
