ch 17
Insects are the most diverse group
of arthropods.
Features unique to mammals include the presence
of hair
A true coelom is completely lined with
A true coelom is completely lined with
The first hominid to spread beyond Africa was
Homo erectus.
All chordates have
a dorsal, hollow nerve cord and a notochord
The platypus is
a monotreme
all chordates have
a notochord sometime during the life cycle.
The common ancestor of all animals is likely to have been
acolonial, flagellated protist.
Nearly all crustaceans
are aquatic
sponges differ from all other animals
by lacking true tissues.
Rays are a type of
cartilaginous fish
he arthropod skeleton is composed of
chitin
New World monkeys have a prehensile tail
compared to old world monkeys
Cnidarians are characterized by stinging cells used for
defense and for capturing prey.
Humans are chordates
echinoderms sre most closely related to chordates
Almost every element of bird anatomy is modified for
enhancement of flight
choanocytes are the
food-trapping cells of sponges
obe-finned fishes includes a lineage that migrated out of
fresh water and adapted to life on land
ingesting food distinguishes animals
from other eukaryotes
he term tetrapod mean s
having four feet
Among vertebrates, the unique feature of lampreys and hagfish
is the absence of jaws
A characteristic that is shared by snakes and birds is
is the amniotic egg.
A feature that freed reptiles from dependence on water for reproduction is
is the amniotic egg.
Swim bladders help bony fish
maintain buoyancy
Ferris wheel exhibits
radial symmetry
A characteristic of arthropods that has allowed for their great success is the presence of
specialized segments
There are more species of arthropods
than any other animal
An octopus is an example of a mollusc
that does not have a shell.
A lancelet is an example of a chordate
that is not a vertebrate.
Roundworms have a cylindrical body
that is tapered at both ends
Monotreme are the mammalian group
that lay eggs
The mobile stage of the cnidarian life cycle is
the medusa stage.
Unique features of vertebrates include
the presence of a skull and backbone.
Flatworms are similar to cnidarians
they have trust issues
a water vascular system is
unique to echinoderms
he human characteristics that evolved first
was erect posture