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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..
Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..
This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..