The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves. The phloem carries food downward from the leaves to the roots. Xylem cells constitute the major part of a mature woody stem or root.
I think the commenters do not have a point. one winter of extreme snowfall or cold temperatures do not effect the realism of climate change and its physical effects to the world such as (global temperature rise, warming oceans, shrinking ice sheets, glacial retreat, decreased snow cover, sea level rise, declining artic sea ice, extreme events, and ocean acidification). Just because we have one cooler summer or one colder winter does not change the facts of the situation.
Explanation:
Don't know if you still need this but this is what I wrote for my PLATO answer.
From the given information, the only thing we can tell is the wave's speed ... 21 m/s . That also happens to be the product of it's (frequency) x (wavelength), but we can't say what either one alone is.
None of the items listed can be calculated without more information.