1. Animals (5)
    • Eukaryotes
    • Multicellular
    • Heterotrophic
    • Mobile
    • Have nerves and muscles
  2. How does multicellularity in animals effect size and specialization?(2)
    • Size- exploit new habitat
    • Specialization- division of labor
  3. Biological macromolecule that provides external support and connects cells to one another
  4. Key concept in biology
    Surface to volume ratio
  5. Larger organisms have relatively less skin, why is this important
    They are still able to do the functions
  6. Because larger animals can't get enough nutrients and gases to interior body across skin, what do they need?
    Transport systems
  7. Theory of how multicellularity occured (2)
    • Mutations triggered gastrulation events
    • Led to layers and specialization
  8. What effect does infolding have on animals?
    Allows cells to get larger
  9. Choanoflagellates and collar cells are nearly indistinguishable, why is this important? (2)
    • Shows a relationship between animals and choanoflagellates
    • Common ancestor
  10. During what major event did animals evolve from protist ancestor?
    Cambrian explosion
  11. Mitotic division of fertilized eggs
  12. 2 layers
  13. 3 layers
  14. Germ layers- what happens to the fertilized cell? From this product what is formed, and what it the final result? (3)
    • Fertilized cell divides
    • Dividing cells form layers
    • Layers form specific tissues and organs
  15. Hox genes (2)
    • Control expression of genes in embryology
    • Common modules of DNA in all animals but sponges
  16. Genes that control development by influencing the rate, timing and spatial pattern of change in an organism
    Hox genes
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