Explain why seedless vascular plants have similar environmental restrictions to nonvascular plants despite having an efficient system for water transport.

Briefly discuss and compare structures that maximize surface area for (1) gas exchange and (2) nutrient absorption as well as (3) mechanisms for transport in the following three groups.  Angiosperms, Platyhelminthes, Mollusca.  Explain functional reasons these structures might vary across the three groups.

Both plants and Echinoderms have vessel like element that move water (plants have xylem, Echinoderms have a water vascular system). Is there ever a point (and if so, when and why) that xylem moves sugars? And is this a case of convergent or coevolution in terms of the vessels?

Diagram the relationship between the sporophyteand gametophyte generations in bryophytes, ferns,gymnosperms, and angiosperms. Show the relative sizesand physical interactions (if any) of the two generations.

Topic bryophytes and ferns