"We can assume that in a relatively short time — perhaps within 100 million years — the one celled organism evolved into a colony of cells. With the further passage of time, groups of cells within those colonies assumed specialized functions of food-gathering, digestion, the structural features of an outer skin, and so on; thus began the stage of evolution leading to the complex, many-celled creatures which dominate life today. The fossil record contains no trace of these preliminary stages in the development of many-celled organisms. The first clues to the existence of relatively advanced forms of life consist of a few barely discernible tracks, presumably made in the primeval slime by soft, wriggling wormlike animals. These are found in rocks about one billion years old. These meager remains are the earliest traces of many-celled animal life on the planet."
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People from New York (state)Agnostics from the United StatesCosmologistsPhysicists from the United StatesAstronomers from the United States
Original Language: English
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Sources
Red Giants and White Dwarfs : Man's Descent from the Stars (1971), p. 249.
https://en.wikiquote.org/wiki/Robert_Jastrow
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Robert Jastrow
Robert Jastrow (September 7, 1925 – February 8, 2008) was an American astronomer, planetary physicist and cosmologist. He was a NASA scientist, populist author and futurist.
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