Biology Chapter 15-1

Biology Chapter 15-1 - 1 Chapter 15 Section 1 Invertebrates...

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Chapter 15 Section 1 Invertebrates Invertebrates Animals that don’t have backbones. 96% of all animals. Come in many different sizes and shapes. Examples: grasshoppers, earthworms, jellyfish, and clams. 3 Different types of Symmetry symmetry = shape 1. bilateral 2. radial 3. asymmetry (no symmetry) Sponges the simplest invertebrates asymmetrical have no guts or nerve tissue If they move, its only millimeters a day. were once thought to be plants Classified as animals because they can’t make their own food. How do sponges eat? They feed on tiny plants and animals. A sponge sweeps water into its body through its pores called ostia . Cells lining the middle cavity called collar cells filter and digest the food. Water leaves the hole at the top of the sponge called the osculum . 1
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Sponges Have Unusual Abilities If you forced a sponge’s body through a strainer, the separated cells could  come back together and reform into a new sponge. If part of the sponge is broken off, the missing part can regenerate, or grow 
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Biology Chapter 15-1 - 1 Chapter 15 Section 1 Invertebrates...

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