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