wake-up 1.what are the three types of skeletons? 2.explain the difference between one way and two...
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Wake-up
1. What are the three types of skeletons?
2. Explain the difference between one way and two way digestion.
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Porifera through AnnelidaThese notes are some of my favorite! I have
included a TON of videos for you to watch. Some are cool and some are really gross. You will
need headphones. Enjoy!
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Invertebrates
Do not have a
backbone/vertebrate
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Phylum Porifera - Sponges
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Characteristics: Simplest group of animals
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Characteristics: They are sessile, which means that they do not move around; attached
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Skeletal system: Spicules; small glass like fragments that provide support
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Characteristics (Watch video) Lack tissue; have individual cells that each perform a specific function
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Feeding: (Watch video: Select Feeding) Absorb food through membrane or trap within mucus and then absorb
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Respiratory system: Diffusion; Sponges absorb oxygen and food from their
surroundings
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Circulatory system: Diffusion; Sponges move oxygen and food from their
surroundings through their “body”
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Reproductive: Budding (Asexual); a new sponge grows from the original
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Reproductive: Fragmentation (Asexual); A piece breaks off of a sponge and then grows
into a new organism
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Reproductive: Hermaphrodite with Internal Fertilization; Both sexes present; Release
sperm to fuse with egg
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Sponge pictures
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Phylum Cnidaria
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Characteristics: All have tentacles
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Two Basic Body Shapes
1. Medusa: Tentacles pointing downward
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Two Basic Body Shapes
2. Polyp: Tentacles pointing upward; often sessile.
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Nematocysts:(Watch video) Structures on tentacles that are used to get prey; like a
Harpoon gun
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Skeletal system: Hydrostatic (Water “skeleton”)
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Digestive system: Two Way
Food moves into the mouth into
the gastrovascular
cavity to be digested and then
back out the mouth
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Respiratory system: Diffusion
Oxygen is absorbed from surrounding environment
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Nervous system: Nerve Net
Network of nerves throughout body; respond to stimuli
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Reproductive system: Budding
Offspring develop from parent; identical copy
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Reproductive system: External Fertilization
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Example: Jellyfish Watch video
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Example: Coral
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Flatworms
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Skeletal system: Hydrostatic
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Digestive system: Two way
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Video of Flatworm eating
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Respiratory system:
Diffusion
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Nervous system: Nerve Cell• Ganglia (control center) with 2 nerve cords
• Eyespots
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Reproductive system: Hermaphrodite; both sexes present for internal
fertilization
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Reproductive system: Regeneration (Fragmentation)Watch Video
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Example: Marine FlatwormsWatch Video
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Example: Tapeworm
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* Watch video: Warning, it is pretty gross
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Nematoda - Roundworms
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Skeletal system: Hydrostatic
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Digestive system: One way
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Respiratory system: Diffusion
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Nervous system: Nerve Cell• Ganglia (control center) with 2 nerve cords
• Eyespots
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Reproductive system: Internal fertilization
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* Another gross video
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Example: Hookworms
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Worms are gross VIDEO
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With the time left over in class you can have time for Tutorials.
Please make sure that you are using your time wisely.