Diatoms generate a silicon dioxide skeleton and they look like little space probes. https://paleonerdish.wordpress.com/2013/06/10/an-introduction-to-diatoms/ h

Diatoms generate a silicon dioxide skeleton and they look like little space probes. https://paleonerdish.wordpress.com/2013/06/10/an-introduction-to-diatoms/ https://paleonerdish.wordpress.com/2013/06/10/an-introductio... https://www.mediastorehouse.com/science-photo-library/diatom-sem-6276921.html https://www.mediastorehouse.com/science-photo-library/diatom...