Chapter 33 - Quiz 7 Flashcards
(60 cards)
features of major importance exhibited by most species are convincing evidence that animals are a
monophyletic group
being a monophyletic group means…
all members more closely related to each other than any members are to another type of organism.
A heterotroph is…
an organism that ingests other organisms to obtain energy
All animals are…
multicellular and heterotrophs
perhaps their most striking characteristic, one directly related to the flexibility of their cells and the evolution of nerve and muscle tissues is an animals ability to…
move more rapidly and in more complex ways
Almost all animals lack a…
backbone
Most animals reproduce…
sexually
Animal cells lack…
cell walls
What Five key innovations can be noted in animal evolution?
symmetry;
tissues, allowing specialized structures and functions,
a body cavity;
various patterns of embryonic development; and
segmentation, or repeated body units.
Other than the typical sponge, Virtually all other animals have…
a definite shape and radial or bilateral symmetry
phylum Cnidaria contains…
jellyfish, sea anemones, and corals
Cnidaria exhibit _______ Symmetry
radial
radial symmetry means…
an organisms parts are arranged in such a way that any longitudinal plane passing through the central axis divides the organism into halves that are approximate mirror images
The bodies of most animals other than sponges and cnidarians exhibit _______ Symmetry
bilateral
bilateral symmetry means…
the body has right and left halves that are mirror images of each other
Animals with bilateral symmetry are called…
bilateria
In some animals pseudocoelom develops embryologically between the…
mesoderm and endoderm
pseudocoelom means…
False coelom
A coelom is a cavity that develops entirely in the…
mesoderm
the coelom is surrounded by wahas referred to as the…
peritoneum
In most animals, the circulatory system is used for…
distributing nutrients to the body and removes waste
In a protostome, the mouth of the adult animal develops from the…
blastopore or from an opening near the blastopore
protostome means…
“first mouth”—the first opening becomes the mouth)
Protostomes include most…
bilaterians, including flatworms, nematodes, mollusks, annelids, and arthropods
