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Ancient Hydrothermal Springs in Arabia Terra , Mars
Introduction: Hydrothermal springs are important astrobiological sites for several reasons: 1) On Earth, molecular phylogeny suggests that many of the most primitive organisms are hyperthermophiles, implying that life on this planet may have arisen in hydrothermal settings [1-3]; 2) on Mars, similar settings would have supplied energyand nutrient-rich waters in which early martian life may have...
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Ancient asexual animal groups, such as bdelloid rotifers and darwinuloid ostracods, are excellent model organisms to study the effects of long-term asexuality. However, the absolute length of time that these groups have been fully asexual is mostly ignored. In the case of the darwinuloid ostracods, the fossil record shows that sexual reproduction disappeared almost completely after the end of P...
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ژورنال
عنوان ژورنال: Science
سال: 1889
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-14.358.406