Early evolution without a tree of life

Evolution: Rooting the Eukaryotic Tree of Life

The root of the eukaryotic tree is a major unresolved question in evolutionary biology. A recent study marshals mitochondrial genes to place that root between the enigmatic Excavates and all other eukaryotes, providing an interesting new perspective on early eukaryotic evolution.

a study on construction of iranian life tables: the case study of modified brass logit system

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The Origin and Evolution of Early Life

Symbiogenesis and the Early Evolution of Life

The concept of symbiogenesis was introduced in 1909 by the Russian biologist Constantin Merezhkowsky as “the origin of organisms by the combination or by the association of two or several beings which enter into symbiosis”. In this article we develop this idea, associated to the Freeman Dyson’s hypothesis, applied to the early evolutive stages of life, considering that it could be a possible ma...

Intentionality Without Evolution: The meaning of life and more

Normativity is certainly a central feature, if not the true hallmark, of intentional phenomena. Believers are essentially things that can be correct or mistaken with respect to the way things are. So nothing warrants being called an account of belief without an attendant account of error. Accounts of intentionality thus ought to provide stories (couched in suitably informative or “naturalistic”...