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At long irregular intervals, Earth's biosphere suffers a catastrophic die-off, a mass extinction, [9] often comprising an accumulation of smaller extinction events over a relatively brief period. [10] The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet's obligate anaerobes.
Try your hand at our Earth Day quiz with answers. ... Answer: National Environmental Education Act, the Occupational Safety and Health Act, and the Clean Air Act. Related: 25 Earth Day Facts.
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 ...
[17] In 2017, the United Nations conducted a Bayesian sensitivity analysis of global population burden based on life expectancy projection at birth in future decades. The 95% prediction interval of average life expectancy rises as high as 106 years old by 2090, with ongoing and layered effects on world population and demography should that happen.
These Earth Day quiz questions and answers will help you learn more about the world around you.
Printable version; In other projects Wikidata item; ... the average number of years that a person can expect to live in "full health". ... 71.17: 22.83: 10.63:
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