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Introduction to AnimalsIntroduction to AnimalsChapter 9 Section 1-2
What is an Animal?What is an Animal?EukaryoteHeterotrophMulticellular
◦Cells are usually arranged into tissues (muscle tissue)
◦Tissues are arranged into organs (heart)
◦Organs are arranged into systems (circulatory system)
Functions of AnimalsFunctions of Animals
1. Obtain food and oxygen2. Maintain stable internal
conditions3. Movement4. Reproduction
◦(Vocab to remember: sexual reproduction, asexual reproduction, fertilization)
Animal SymmetryAnimal SymmetrySymmetry: balanced
arrangement of partsTwo types
◦Bilateral - One line divides into halves that are mirror images (Isosceles triangle)
◦Radial – many lines of symmetry that all go through a central point (circle)
Asymmetry – no symmetry
Animals with Radial Animals with Radial SymmetrySymmetryParts arranged
around a center point
Live in waterDon’t have a
front or back end
Do not move fast
Animals with Bilateral Animals with Bilateral SymmetrySymmetryMore complex Have a front
endMove more
quicklyMost have
sense organs on front end (eyes, whiskers, nose, ears)