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Endosymbiosys is the process in which one species is engulfed by another, and continues to live inside the host in a symbiotic relationship.
Roughly 2.2 billion years ago an archaea virus absorbed a bacterium to create X.
1.6 billion years ago, cyanobacteria was absorbed by some advanced organism creating Y.
Can you identify X & Y, which have had life changing impact on Earth?

Show Answer
X is Mitochondria, the powerhouse of the cell.
Y is chloroplast, the substance which absorbs sunlight to make energy, & is responsible for making plants.
A new such phenomenon was recently found. Read More.