Step 1 . Using your textbook, other websites from the links provided, and the explanations below, determine which set(s) of characteristics each animal has. In a Data Table like the one below , place an "x" in the box if the animal has the characteristic. Count up the number of x's for each animal and place the total at the bottom of the Data Table
Explanations of Characteristics:
set #1: Dorsal nerve cord (running along the back or "dorsal" body surface)
Notochord (a flexible but supporting cartilage-like rod running along the back or
"dorsal" surface)
set #2: Paired appendages (legs, arms, wings, fins, flippers, antennae)
Vertebral column ("backbone")
set #3: Paired legs
set #4: Amnion (a membrane that holds in the amniotic fluid surrounding the embryo; may or
may not be inside an egg shell)
set #5: Mammary glands (milk-secreting glands that nourish the young)
set #6: Placenta (structure attached to inside of uterus of mother, and joined to the embryo by
the umbilical cord; provides nourishment and oxygen to the embryo)
set #7: Canine teeth short (same length as other teeth)
Foramen magnum forward (spinal cord opening, located forward, under skull)Evolution &
set #1: Dorsal nerve cord (running along the back or "dorsal" body surface)
Notochord (a flexible but supporting cartilage-like rod running along the back or
"dorsal" surface)
set #2: Paired appendages (legs, arms, wings, fins, flippers, antennae)
Vertebral column ("backbone")
set #3: Paired legs
set #4: Amnion (a membrane that holds in the amniotic fluid surrounding the embryo; may or
may not be inside an egg shell)
set #5: Mammary glands (milk-secreting glands that nourish the young)
set #6: Placenta (structure attached to inside of uterus of mother, and joined to the embryo by
the umbilical cord; provides nourishment and oxygen to the embryo)
set #7: Canine teeth short (same length as other teeth)
Foramen magnum forward (spinal cord opening, located forward, under skull)Evolution &