The vertebrate cerebrum (brain) is formed by two cerebral hemispheres that are separated by a groove, the medial longitudinal fissure.The brain can thus be described as being divided into left and right cerebral hemispheres.n eutherian (placental) mammals, the hemispheres are linked by the corpus callosum, a very large bundle of nerve fibers. Smaller commissures, including the anterior commissure, the posterior commissure and the hippocampal commissure also join the hemispheres and these are also present in other vertebrates.
Although today ubiquitous across the globe, the peanut (Arachis hypogaea) was native only to South America, and it is believed to come from the foothills of the Andes in Bolivia and Peru. Ancient, anthropologists have found evidence of peanut cultivation dating back at least 7,600 years.
The earliest reference to peanut butter being made goes all the way back to the Ancient Incas and the Aztecs, though whether they were the first or not isnât known (peanuts themselves are known to have been cultivated as far back as 7000-8000 years ago).