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Biology Honors Biology Honors Chapter 14
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Multicellular (many cells) Eukaryotic (cells contain nucleus) Heterotrophic (must eat) Lack cell walls Move
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34 total phyla in the kingdom Classifying criteria: Body symmetry Level of organization
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Asymmetry No symmetry Radial symmetry Circular shape Bilateral symmetry Identical right & left halves
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Cells Simplest animals are made of independent cells Tissues Cells work together to form specialized tissues like muscle tissue Organs Tissues work together to form organs; that do a specific job
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Asymmetrical Organized into cells Aquatic animals Sessile, filter feeder Examples: Sponges
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Radially symmetrical Organized into tissues Live in shallow coastal marine waters Have stinging cells called cnidocytes Examples: Jellyfish Sea Anemones
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Flat worms Bilaterally symmetrical Complex tissues: nerves and brain Mostly parasitic Examples: Tapeworms Planarian
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Round worms Bilateral Symmetrical Organized into tissues Complete digestive tract Examples: Round worms Hook worms Pinworms
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Segmented worms Divided into sections with a well developed heart & a closed circulatory system Examples: Earthworm Bristle worm Leeches
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Soft body, occasional shell Organized on the organ level Examples: Clams Squid Snails Octopi – has tentacles
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Over one million species Have jointed appendages Head, thorax, & abdomen Have an exoskeleton Examples Spiders Crayfish Insects
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Have an internal skeleton Radially symmetrical Well developed organs and systems Examples: Sea stars Sea lilies Sea urchins
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Most advanced animals Well developed brain & nervous system Bilaterally symmetrical All reproduce sexually Examples: Fish Amphibians Reptiles Mammals Birds
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