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1) What kind of symmetry do sponges have?
Asymmetry (no symmetry)
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Where does water enter the sponge?
Porocytes
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Where does water exit the sponge?
Osculum
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What causes the flow of water through the sponge?
The beating of the flagella
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Where are the flagella flound?
Chaonoctyes
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Besides the beating of the flagella what is the other function of the chaonocytes?
The obtaining of nutrients
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Why are sponges considered simple organisms?
Lack a muscle system, digestive track, nervous system, circulatory system, tissue and organs
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What are the characteristics of true animals? (eumetazoans)
Symmetry and tissue
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What are the layers that all true animals develop?
- Ectoderm
- Mesoderm
- Endoderm
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What type of symmetry do cnidarians have?
Radial
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What are two body forms of cnidarians?
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What do cnidarians use to capture prey?
Cnidocytes
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What causes the nematocyst to fire?
The trigger
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What are the three differences between the medusa and polyp?
- Medusa: free floating, gelatinous, lots of mesoglea, mouth and tentacles face downwards
- Polyp: Cylindrical, pipe-shaped, attached, little mesoglea, mouth and tentacles face upward
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What is the advantage of being bliaterally symmetrical?
Cephalization which then led to different prats of the body becoming specialized in different ways
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What was the first simple organism to develop bilateral symmetry?
Flatworms
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What kind of body cavity do flatworms have?
No body cavity do to aceolomate body
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Why must flatworms be flat?
Because they don't have a circulatory system
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What type of symmetry do roundworms have?
Bilateral symmetry
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What type of coelem do roundworms (nematodes) have?
pseudocoelom
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What is the advantage of psuedocoelom?
Circulation, movement, organ function
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What are three classes of phylum moluska?
Bivalves, cephalopods, gastropods
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