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