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The continuity of life between any two extant organisms (one generation at a time by way of their common ancestor)
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- Which bits of evidence would convince you that life originated as early as 3.2 BYA?a. You look at a microfossil under a scanning electron microscope and it is the same shape as a cell.b. A high-quality transmission electron micrograph of a fossil cell reveals cellular compartments, including a possible nucleus.c. Potassium dating of a fossil containing a possible cell indicates that the fossil is 3.2 billion years old.d. Using transmission and scanning electron microscopy, you find evidence of a carbon-based material in what appears to be a cell wall of a fossil isotopically dated as 3.2 billion years old.
- As parallel and collateral evolution represent different historical processes, they leave distinct phylogenetic signatures. At the level of an individual nucleotide position, the phylogenetci signals of parallel and convergent evolution can be identical. So how can the events be distinguished?
- Durch welche besonderen Bau- und Funktionsmerkmale erreicht die Lunge der Vögel eine deutlich höhere Leistungsfähigkeit (höhere Diffusionsrate) gegenüber der Lunge der Säugetiere?