ANIMALS

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Animals
Chapter 9
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Structure of Animals
- What Is an Animal?

• The cells of most animals are organized into
  higher levels of structure, including tissues,
  organs, and systems.

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Classification of Animals
- What Is an Animal?

• This branching tree shows how the major animal
  groupsare related.

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Vertebrae Spinal Cord In a Human
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Vertebrae Spinal Cord In a Human
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Animals
Symmetry
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Which type of symmetry?
For each slide, think of the actual animal.
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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

13
ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

15
ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• Radial symmetry
• Bilateral symmetry
• Asymmetry

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ANIMALS

• ventral

B
C
A
D
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ANIMALS

• dorsal

B
A
C
D
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ANIMALS
B

• posterior

A
C
D
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ANIMALS
B

• anterior

A
C
D
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Radial Symmetry

• Radial symmetry The vast majority of organisms
  displaying radial symmetry are anchored to the
  substrate (often referred to as a sessile
  lifestyle, sort of like couch potatoes). 
  Although all lateral surfaces have equal
  likelihood of interacting with the environment in
  a meaningful manner, the top and bottom of
  the organism have very different functions.  The
  lower surfaces are often modified to provide a
  stable, concrete point of attachment to some
  solid surface, while the upper surfaces are often
  modified for the gathering of resources (usually
  food).  Because lateral organization is
  relatively unimportant but vertical organization
  is meaningful, symmetry around this central
  vertical axis becomes the most useful body plan

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Web Sites

• For more information, visit www.brainpop.com
• Select Vertebrates Invertebrates