Deep brain stimulation (DBS) is a technique developed to treat neurological disorders through direct brain electrostimulation and presently used to treat severe Parkinson's Disease patients that suffer from extreme motor dysfunction (tremors) caused by the condition. The importance when electrically dealing with the brain is size and material used to make the needed electrodes
I believe the answer is "The oldest Earth rocks are 3.9 billion years old."
I think the answer is proteins
Reclassification of fungi
Explanation:
Fungi were classified under kingdom plantae by the earlier taxonomists due to their similarities. Both of them were grown on the ground and fixed to the ground, they do not move, fungi like plants also produced fruiting bodies.
However, there were many physiological, morphological, genetic, and biochemical features which were unique and different from other kingdoms.
Although, the fungi contain similar features like vacuoles, secondary metabolites, myecelial root-like structures; fungi like plants do not have a complete vascular system.
Hence, the previous classification under plants was reconsidered and fungi were reclassified as a separate kingdom next to the protists and before the plantae kingdoms.