Lineage

... 1. Stem cells are totipotent in that they can be made to be any cell in the organism. Totipotent cells have not been differentiated to a specific lineage. Progenitor cells are a step towards being differentitated in that they are called pluripotent and can make any cell of that lineage (muscle ...

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... the first paragrph to read: Speciation Speciation is a process that causes enough change in genotype or phenotype that they branch off from the lineage they once were to become a new "subspecies" and with sufficient change become a new "species". In farming there are "breeds" ...

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... Theory Of Intelligent Design Speciation Speciation is a process that causes enough change in genotype or phenotype that they branch off from the lineage they once were to become a new "subspecies" that with further change becomes a new "species". In farming there are "breeds" ...

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... WITH THE DISTINCTION that this "bird" is not necessarily a new species Bird1.0 of my example will go on to be the predecessor of a new lineage of organisms - ie Class Aves. At what point a new species emerges is not necessarily clear and i said you are not answering the question- which ...

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... It is indeed difficult(impossible?) to develop a definition of "species" that applies to ALL LIFE ; however, within discreet lineages (which you were kind enough to spamquote wikipedias list of) a species is MUCH more defineable. So, just because the same definition of species ...

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