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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

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