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function of Muscular foot
locomotion
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function of visceral mass
contains internal organs
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function of mantle
covers the visceral mass
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what is the mantle cavity
a water filled chamber that houses the gills
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radula
a rasping organ used for scraping up food
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Do all mollusc have radula
Most have
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what do bright colors signify
toxic, don't eat me
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what kind of a system do mollusc have that nematodes and flatworm miss
circulatory
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diff grps of mollusc
gastropods, cephalopods, bivalves
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largest grp of mollusc
gastropods
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which group of mollusc live on land
gastropods
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distinct feature of gastropods
A single spiral shell and a distinct head with eyes on tips of tentacles
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Function of shell in mollusc
For protection when the animal feels threatened
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How do mollusc breathe
By lining of the mantle cavity
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how are slugs different from other mollusc
They don't have a shell and mantle
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How do slugs breathe
slug have projections on them that function as gills
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Ex. of bivalves
clams, oysters, mussels and scallops
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describe Bivalve shells
two halve shells that are hinged together
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How do bivalves feed
suspension feeders
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function of mantle in bivalves
for housing the gills.
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in Bivalves-Gills function
gas exchange as well as for feeding a function of
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Where are bivalves found
found in the Mud
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Are bibalves motile or sedentery
sedentary
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can skitter along the sea floor by flapping its shell
1) mussel
2) scallop
scallop flap its shell and
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Nautilus is an example of
Cephalopod is the example of
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Which mollusc is the most agile and fast at moving
cephalopod
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which cephalopod has a shell and which cephalopd misses one
squid has a shell, while octopus misses a shell
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which mollusc has the most sophisticated eyes in the animal kingdom
cephalopods
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which phylum has the most sophisticated eyes
mollusc
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how do mollusc capture their prey
mollusc use tentacles
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how do mollusc rip and crush the prey
mollusc have radulla
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Where is the mouth in the cephalopod
near the foot
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which is the most intelligent invertebrates
octopus
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Annelids are worms with
1)scales
2)segments
segments
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annelids- Phylum is
phylum Annelida
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Ex of annelids
Earthworm, leeches, polychaetes
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use of segmented bodies in annelids makes the body
annelids are flexible
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what does segmented body in annelids help in?
in annelids, burrowing and crawling in the soil
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Which are the three systems found in annelids
- nervous system made up of brain and nerve cord
- excretory system: dispose fluid waste
- digestive tract- passes from mouth to anus
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which system in annelids is not segemented
in annelids the excretory system is the only one.
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open circulatory system
Blood is pumped thro blood vessels that opens into the body cavity and so organs are bathed in blood
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Closed circulatory system
- Blood circulates the body through vessels
- It distributes nutrients and oxygen he body throughtout the body
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Ex of open circulatory system
mollusc, arthropods
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Ex of closed circulatory system
annelids and vertebrates
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what is the function of thickened region in earthworms
to pick eggs and receive sperms
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A single Earthworm can produce both eggs and sperms so it is called a
hermaphrodite
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which is the largest grp of annelids
polychaetes
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where do polychaetes name come from
name came from hair or bristles
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polychaetes have appendages filled with
1) water
2)blood
blood in polychates
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how do polychaetes breath
gills
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what function as gills in polychaetes
in polychaetes the appendages
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Leeches are famous for
blood sucking habit
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who are used in medicine
leeches are used
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how are leeches used in medicine
to produce anticoagulant to dissolve blood clots formed during surgery or heart disease
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arthropods-phylum is
arthropoda
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ex of arthropoda
crayfish, crabs, spiders, ticks, insects, spiders, barnacles, lobsters
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what does phylum arthropoda mean
this phylum means jointed appendages
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eg of annelid and plathyhelminthes that are parasitic
leech and tapeworm
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Arthropods body are covered by
arthropods- have exoskeleton
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what is molting
sheding of the shell
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Different appendages in arthropods
appendages found are head, thorax and the abdomen
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Describe the appendages in arthropods
- head: sensory antenna, eyes and mouth.
- Thorax: defensive appendages
- abdomen: swimming appendages
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Chelicerates are
arthropods
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ex. of Chelicerates
Horseshoe crabs, spiders, ticks, mites and scorpions collectively called arachanids
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arachanids include
mites, spiders, ticks, and scorpions
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millipedes have how many legs in each seg
2 legs in each seg
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centipedes have how many legs in each seg
1 leg in each seg
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ex of Crustaceans
Crabs, lobsters, crayfishes, and barnacles
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how do barnacles feed
They strain the food from water using jointed appendages
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Why are insects considered the most successful animal?
They have segmented body, an exoskeleton, jointed appendages, the cuticles is water proof, metamorphosis
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