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The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The Earth-Moon system is formed after a giant impact by the hypothetical planetoid Theia A major collision with a Pluto-sized planetoid causes the Martian dichotomy, forming Mars' North Polar Basin. The Sun enters main sequence: solar wind sweeps Earth Moon system clear of debris (mainly dust and gas). 4.5–3.5 Ga: Hadean eon beginning of ...
All life on Earth can be traced back to a Last Universal Common Ancestor, or LUCA—and it likely lived on Earth only 400 million years after its formation. ... 20,000 Malibu area residents face ...
Earth remains the only place in the universe known to harbor life. Geochemical and fossil evidence from the Earth informs most studies of abiogenesis. The Earth was formed at 4.54 Gya, and the earliest evidence of life on Earth dates from at least 3.8 Gya from Western Australia.
In “A City on Mars,” Kelly and Zach Weinersmith investigate what life would be like for humans on the red planet, arguing that Elon Musk’s dream is doomed to fail.
Natural selection is tantamount to common descent in that long-term occurrence and selection pressures can lead to the diversity of life on earth as found today. All adaptations—documented and undocumented changes concerned—are caused by natural selection (and a few other minor processes).
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