Phylum Platyhelminthes

  1. Worm Prevalence Speculation: worm form maybe the ___ to house a ___

    1. Simplest way; complete digestive system

  2. Complete digestive system: ___ at one end and ___ at the other

    1. Mouth; anus

  3. A complete digestive system provides ___

    1. Huge benefits

  4. Worm Prevalence Speculation: worm body has much ___ in contact w ___

    1. Surface area; substrate

  5. Surface area in contact w substrate makes ___ and ___ easy

    1. Swimming; crawling

  6. Phylum Platyhelminthes:

    1. Flatworms

  7. Feature 1: all are ___

    1. Acoelomate

  8. Acoelomate: ___ w no ___ or ___

    1. Solid; body cavity; coelom

  9. Coelom

    1. Body cavity

  10. ___: a loose net like aggregation of ___

    1. Parenchyma; irregularly shaped cells

  11. Feature 2: show some ___ including brain like cluster of ___ at 1 end

    1. Cephalization; ganglia

  12. Ganglion

    1. A cluster of neurons

  13. Feature 3: ___ flattened

    1. Dorsoventrally

  14. Feature 4: if a ___ exists ___ is the only opening

    1. Digestive system; mouth

  15. Feature 5: lack ___ and ___ systems

    1. Respiratory; circulatory

  16. Feature 6: lack a ___ – body is ___

    1. Skeleton; entirely soft

  17. Feature 7: ___ – body derived from ___ germ layers

    1. Triploblastic; three

  18. Recall: all cnidarians are ___

    1. Diploblastic