In the field of human genetics, mitochondrial eve refers to the maternal "MRCA" (most recent common ancestor). In other words, she was the woman from whom all living humans today descend, on their mother's side, and through the mothers of those mothers and so on, back until all lines converge on one person. Because all mitochondrial DNA (mtDNA) is generally passed from mother to offspring without recombination, all mitochondrial DNA (mtDNA) in every living person is directly descended from hers by definition. Mitochondrial Eve is the female counterpart ofY-chromosomal Adam, the patrilineal most recent common ancestor, although they lived thousands of years apart.
     To know we as humans come from one woman, and all have dispersed throughout the world and became our own races and developed our own cultures, is crazy to think about. 

Amphioxus

The Amphioxus also known as the Lancelet, is found in the shallow more temperate or tropical waters buried in the sand. These little sea creatures are actually used for food for humans and animals in Asia. This sea creature is a very important species to scientist and zoology because they allow them to study the origins of vertebrates. They are a starting point on how vertebrates have evolved and adapted over time.