What is the source of most of the mass in plants?

Please identify this plant: curly leaves http://farm1.static.flickr.com/209/496222110_2080669081_o.jpg

I have a wonderful patch of empty dirt between my garage and sidewalk and don't know what to put there, last year I tried raspberry canes and blueberries but there wasn't enouph sun and they didn't produce any berries, It is in shade all the time, I was thinking of some pretty flowers and maybe a...

A thin circular sheet of aluminum has a radius of 20 cm and a thickness of 0.50 mm. Find the mass of the sheet.

What mass of lead(II) nitrate is present in 20.0mL of a solution? See below. Two different lead(II) nitrate solutions are used, each sample is reacted with an excess quantity of a potassium iodide solution, which produces lead(II) iodide.