Phosphorus cycle: reservoirs, limiting factors, residence time

1. 1RNA, ATP, and DNA are ____ parts and silicon shells are ____ parts.

   1. ASoft, hard.
   2. BHard, soft.
2. 2The largest reservoir of P is:

   1. ALithosphere, in apatite which can be found in igneous rocks, bones, and bird shit.
   2. BOcean.
3. 3P is the limiting factor on _______ and N and Fe are the limiting factors on _______.

   1. ALand, ocean.
   2. BOcean, land.
4. 4Residence time for P is:

   1. A10k on land, 50k in the ocean, and millions in the sediment.
   2. BWrong answer lel

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