Which of the following was most likely the first living organism on earth

Cyanobacteria would be the first living thing on earth.

Explanation:

This would make sense because bacteria is always lurking somewhere even if it isn't in any organism. Bacteria can live in rocks or sand. So it would make sense that some type of bacteria would be the oldest thing.

Bacteria could be also one of the last living thing on earth as well.

If you have any questions feel free to ask in the comments - Mark

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relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

the sun d the answer is sun