Evolution from Space

absorption algae amino acids Anapsida ancestral Ångströms animals appear argued argument Arrhenius atmosphere atoms bacteria bacterium biochemical biologists biology biotic material Blyth breeding group calculation carbon dioxide chain chance changes chapter chemical cm³ coli comets complex cosmic creatures cytochrome Darwin density discussed doses Earth Edward Blyth effect environment enzymes eukaryotic eukaryotic cells evidence evolution evolutionary existed extinction fossil record galaxy genes genetic material genome grains graphite happen hemoglobin histones insects intelligence interstellar legumes life-forms living cells logic Lyell mammals micro-organisms microfungi micrometre million years ago monotremes mutations natural selection observed occur organic Origin of Species oxygen panspermia particles particular physical plants polypeptide polyploidy possible present pressure problem prokaryotes protozoa question radiation random remarkable scientific sequence shows silicon chip situation solar system space star structure supposed surface survive t-RNA molecules temperature terrestrial ultraviolet light universe wavelength X-rays yeast cells