Term
| what did animals evolve from? |
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Definition
| a colonial protist that lived in the seas during the precambrian era |
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Term
| when did animals go under rapid diversification? |
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Definition
| beginning of Paleozoic (545 million years ago) |
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Term
| what are the 4 key evolution branch points of animals? |
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Definition
1. 3 true tissues (ectoderm, mesoderm, endoderm)
2. body symmetry (radial and bilateral)
3. coelom (fluid filled space separating digestive tract from outer body wall) led to complex animals
4. embryonic development of a true coelom |
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Term
| are most animals vertebrates or invertebrates? |
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Definition
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Term
| what is the phyla of sponges? |
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Definition
|
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Term
| how do sponges reproduce? |
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Definition
| fragmentation (asexual) or sexual (hermaphrodite) |
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Term
|
Definition
| through filter system - lack of true tissue |
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Term
| what are the 2 kinds of cells on the inside of a sponge? |
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Definition
chanocytes - has flagella and grabs food and filters water
ameobocyte - moves by pseudopodia |
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Term
| what is the opening in the middle of the sponge? |
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Definition
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Term
| what animals are in phylum Cnidaria? |
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Definition
| hydras, jellyfish, corals, and sea anemones |
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Term
| what cnidarian is not marine? |
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Definition
|
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Term
| what kind of symmetry does phylum Cnidaria have? |
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Definition
|
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Term
| what tissue layers do cnidaria have? what does this mean about organs? |
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Definition
only 2, ectoderm and endoderm
no organs |
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Term
| what kind of digestive system do Cnidaria have? what does this mean? |
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Definition
incomplete digestive system
only 1 opening, mouth is also anus |
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Term
| what kind of reproduction does phylum Cnidaria have? |
|
Definition
sexual and asexual
budding is asexual |
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Term
| what do all cnidarians have? (arms) |
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Definition
|
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Term
| what really happens in a jellyfish sting? |
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Definition
triggers are pushed and they push out coil and sting prey.
called cnidoblasts |
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Term
| what animals are in phylum Platyhelminthes ? |
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Definition
| flatworms, flukes, tapeworms |
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Term
| where do animals in phylum Platyhelminthes live? |
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Definition
| all environments, including parasitic |
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Term
| what kind of symmetry do Platyhelminthes have? |
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Definition
|
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Term
| what tissue layers do platyhelminthes have? |
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Definition
|
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Term
| what kind of digestive system do platyhelminthes have? |
|
Definition
|
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Term
| what organs do platyhelminthes have? |
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Definition
| several including reproductive and excretory |
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Term
| what are the "ears" and "eyes" on planaria flatworms really? |
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Definition
auricles are chemoreceptors
eyespots are photoreceptors |
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|
Term
| what does a tapeworm have on its head? |
|
Definition
scolex
the little hooks attach and it feeds into you |
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Term
| what does ascoelomate mean? |
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Definition
|
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Term
| what kind of animals live in phylum Nematoda? |
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Definition
|
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Term
| what kind of environment do nematodes live in? |
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Definition
| all environments, including parasitic |
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Term
| what kind of symmetry do Nematoda have? |
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Definition
|
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Term
| what kind of digestive system do Nematoda have? |
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Definition
|
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Term
| what kind of body cavity do Nematoda have? |
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Definition
| not completely lined (pseudocoelom) |
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|
Term
|
Definition
a body cavity that is not completely lined
for it to be completely lines, there has to be mesoderm on both sides of the coelom |
|
|
Term
| what is a completely lined body cavity? |
|
Definition
ectoderm
mesoderm
coelom
mesoderm
endoderm |
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|
Term
| what kind of organs do Nematoda have? |
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Definition
|
|
Term
| how do Nematoda reproduce? |
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Definition
|
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Term
| what phylum does the genus Ascaris belong to, how do you get it and what does it do? |
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Definition
Nematoda
eating raw pork
burrows out of stomach, travels through blood stream, goes back to stomach, reproduces very quickly |
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Term
| what do microscopic nematodes cause? |
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Definition
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