Dec. 21, 2017, 2:21 a.m.
Where Does the Sand Come From?
This image from NASA's Mars Reconnaisance Orbiter (MRO) shows one possible place where sand grains are being produced on Mars today.
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Pollen tube guidance towards the ovule is an important step for fertilization in flowering plants. In order for this to happen, a pollen tube attractant peptide LURE guides the pollen tube precisely to the ovule. Plant biologists have succeeded in analyzing for the first time, the crystal structure of LURE bound to its receptor protein PRK6.https://www.sciencedaily.com/releases/2017/12/171229095136.htm
If sand grains get destroyed over time, will earth beaches disapear? At least those far away from sand sources?