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(First row): Sol 809 and Sol 869. (Second row) Sol 905 and Sol 905. Specimens photographed in Gale Crater and that are quantitatively and statistically nearly identical to Ediacaran fossils of Namacalathus (two, bottom left) and (with the exception of tail length) Cambrian fossils of Lophotrochozoa (three bottom right). Photos of Namacalathus reproduced from and courtesy of Kontorovich et al. 2008. Photos of Lophotrochozoa reproduced from and courtesy of Zhang et al. 2014.

(First row): Sol 809 and Sol 869. (Second row) Sol 905 and Sol 905. Specimens photographed in Gale Crater and that are quantitatively and statistically nearly identical to Ediacaran fossils of Namacalathus (two, bottom left) and (with the exception of tail length) Cambrian fossils of Lophotrochozoa (three bottom right). Photos of Namacalathus reproduced from and courtesy of Kontorovich et al. 2008. Photos of Lophotrochozoa reproduced from and courtesy of Zhang et al. 2014.

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In the space of the entire universe, the only conclusive evidence of life, is found on Earth. Although the ultimate source of all life is unknown, many investigators believe Earth, Mars, and Venus may have been seeded with life when these planets, and the sun, were forming in a galactic cluster of thousands of stars and protoplanets. Yet others hyp...