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Animals
Heterotrophic Multi-cellular Most can move More complex No cell walls
3 Challenges All Animals Face:
What size, and shape am I?
How do I sense/respond to things?
How do I move? What supports me?
(There are others and we will be covering those in the coming days!)
What does my body look like?
Three types of symmetry:
AsymmetryBilateral symmetry
Radial symmetry
http://www.misterteacher.com/orange%20and%20black%20butterfly.jpg
http://www.hope.edu/academic/art/past/VanderBurgh/mapleave.rose2.jpg http://daphne.palomar.edu/design/asymm/
jd01asym.jpg
Specifics on Symmetry No symmetry (Asymmetrical): can’t cut the
organism in any way to get even halves
Bilateral: can cut in 2 even halves
Radial: can cut several ways to get even halves
Pentaradial: special type of radial symmetry Can cut 5 different ways Example: Seastar
How do I move? What supports me?
Can be invertebrates or vertebrates What’s the difference?
Invertebrates vs. Vertebrates* No backbone * backbones*often have exoskeletons * endoskeletons
Types of Skeletons Hydroskeletons:
Invertebrates living in water Fluids allow animal to hold its shape
Exoskeletons: External skeleton Hard jointed body of chitin Have to molt to grow
Endoskeletons: Vertebrates and echinoderms Support, protection, & movement Can be cartilage or bone
Segmentation?
Repeating Parts or segments Paired with bilateral symmetry Can be internal or external repetition Examples: worms, insects, vertebrates Are we segmented?
Support & Movement: Limbs
Appendages or Limbs: Bristles, Legs, Flippers, Wings Internal support or external support
differs between invertebrates and vertebrates
How do I sense/respond to things?
I might have cephalization A concentration of sense organs and nerve
cells at anterior end can be a “head” This area is often different than other parts of
the body Who would have a head?
Does size matter? Invertes vs. Vertes? Other? Nerve Net:
Net like nervous system, no central head
Invertebrates
VERTEBRATES