44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
[[G11 Pre-AP Biology]]
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Multicellular eukaryotes.
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Cells lack cell walls.
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Heterotrophs.
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Mobile in at least one stage of life.
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Sexual reproduction.
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![[Pasted image 20261001105644.png]]
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# Level of Organization
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Cells, tissue, organs, organ systems.
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Sponges only have 2 layers of cells, no tissues.
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"Hydra, jelly fish, corals, sea anemones: 2 layers of cells, but have tissues like
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muscle and NS"
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# Number of Body Layers:
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Do they have 3 layers (ectoderm, mesoderm, endoderm).
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Ectoderm: Skin and ns, shell, scales, feathers.
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Endoderm: Inner lining of gut, respitory system.
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Mesoderm: Circulatory, reproductive, excretory, muscular.
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"Sponges, corals, hydra, jelly fish do not have 3 body layers"
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![[Pasted image 20261001110343.png|417]]
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# Symmetry and Body Plans:
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Radial symmetry, bilateral symmetry, no symmetry.
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# Body Cavity
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Fluid filled body cavity called coelom.
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![[Pasted image 20261001110522.png]]
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# Segmentation
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![[Pasted image 20261001110549.png]]
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# Embryonic Openings
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Protostomes: Opening develops into mouth.
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Deuterostomes: Opening develops into the anus.
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# Movement
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Sessile/stationary (attach to one place as an adult) vs ability to move.
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# Reproduction
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Mainly sexual, internal vs external fertilization.
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# Presence of Backbone
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Vertebrates vs invertebrates. |