Extremophiles

(Diatoms)


Diatoms are very fragile unicellular organisms that have a yellow-brown chloroplast that enables them to photosynthesize. Their cell walls are made of silica. The construction of the cell wall, called the frustule, consists of two valves that fit into each other like a little pill box.
The colour of the chloroplast is yellow-brown apposed to the more common green. 


This extremophile could resemble a time where cells were beginning to become more complex through the process of endosymbiosis where cells absorbed other cells to become more complex.