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What distinguishes gymnosperm seeds from angiosperm seeds?

Deep scattering layer Oceanographers and fishing crew are familiar with the “deep scattering layer” on fish-finder sonar systems. a)  What is this layer?  Be as specific as you can. b)  When does this layer move up, and why? c)  When does this layer move down, and why?

Which floral organ produces pollen?

Lycophytes are unique among land plants in that they __________.

For a patient who is suspected of having a stroke, the most important piece of information that the nurse would obtain is    

Coastal New England and northeastern Canada are sometimes hit by hurricanes primarily because ____.

Which of the following is an innovation associated with seed plants?

In Isoetes, which has a heterosporus life cycle, archegonia are produced by _____________.

All vascular plants have ______. 

Global warming and sea level: a) How has global warming caused global sea level to rise over the past century?  Explain 2 different mechanisms, and why each one lowers sea level.. b) Where are the 2 regions of ice that could cause the largest global sea level rise if they melt?