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Notes: Animals. Animal Characteristics. Heterotrophic – obtain food and energy by feeding Multicellular – made of many cells Eukaryotic – contain a nucleus Vertebrates – 5% of all animals Invertebrates – 95 % of all animals. Types of Animal tissues. 4 Types Epithelial – skin

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Animal characteristics
Animal Characteristics

Heterotrophic – obtain food and energy by feeding

Multicellular – made of many cells

Eukaryotic – contain a nucleus

Vertebrates – 5% of all animals

Invertebrates – 95 % of all animals


Types of animal tissues
Types of Animal tissues

4 Types

Epithelial – skin

Muscular - muscles

Connective –blood and bone

Nervous – nerve cells


Essential animal functions
Essential Animal Functions

1. Feeding

  • Herbivores - manatee

  • Carnivores – sharks, sea anemones

  • Omnivores

  • Detritivores – most bottom dwellers

  • Filter feeders – sponges, clams, oysters

    2. Respiration

  • Take in oxygen and give off carbon dioxide.

  • Many inverterbrates do this by diffusion.

  • Complex animals use gills or lungs.


  • Animal functions cont d
    Animal Functions, cont’d.

    Circulation – how materials move around the animal. (diffusion or circulatory systems)

    Excretion – removal of waste. Could be cells that pump waste out or organs. Waste is ammonia

    Response – nerve cells. This could be a simple nerve net or complex nervous system.

    Movement – some animals are sessile – stay attached to something their adult life. Others are motile – move by muscles or muscle-like tissue.

    Reproduction – sexual or asexual. Many simple animals have the ability to do both.


    Body symmetry
    Body Symmetry

    Asymmetrical – no body plan Ex. Sponges

    Radial symmetry – body parts repeat around the center. Ex. starfish

    Bilateral symmetry – body can be divided up into two equal halves (left and right) Ex. whale


    Notes animals
    Cephalization – concentration of the sense organs at the front end of an animal. Not all animals show this.