Bio exam 3

Animals w/ bilateral symmetry typically undergo an evolutionary process whereby many nerve cells and sensory structures become concentrated at the front of the body. What is this process called?
segmentation
radiation
pupation
coelom formation
cephalization
most animals show ____ symmetry
radial
multilateral
no
bilateral
unilateral
which statement most accurately describes deuterosomes?
the first opening on the embryo surface becomes the mouth
their food and wastes enter/exit through the same body opening
they have an incomplete digestive system
they all have radial symmetry
their mouth develops from the second embryonic opening and the first opening becomes the anus
which animal group does not have tissues?
nematodes
cnidarians
echinoderms
sponges
flatworms
4/5 of the answers are arthropods. select the exception
spiders
bees
ticks
lobster
octopus
the mollusks w/ the largest brain and most complex behavior are the
bivalvles
gastropods
cephalopods
chelicerates
chitins
what is a disadvantage of an exoskeleton?
it's not flexible enough to allow a full range of movement
it must be shed for its owner to grow
it is not able to absorb pigments for sufficient camouflage
it allows for excess water loss
it does not provide as efficient a muscle anchorage as an endoskeleton
the water-vascular system in sea stars is used primarily for
excretion of excess water
locomotion
circulation
sensation
nemocysts in cnidarians are
defensive cells
sets of muscle cells
circulatory cells
reproductive cells
excretory organs
flukes and tapeworms belong to the phylum
proifera
platyhelminthes
cnidaria
nemotoda
annelidia
a circulatory system in which the heart pumps blood to tissues throughout the body cavity is a(n)
incomplete circulatory system
closed circulatory system
open circulatory system
gastrovascular cavity
complete circulatory system
leeches and earthworms belong to the phylum
mollusca
nemotoda
porifera
platyhelminthes
annelida
 
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