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Biology, 22.06.2019 16:30
The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?
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Biology, 22.06.2019 18:10
Ineed a little . why do you think there is a basic difference between the kinds of fertilization most common in aquatic and terrestrial animals?
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Biology, 22.06.2019 18:30
On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?
Answers: 3
Where do the birds in the above food web get the matter needed to make beta-keratin?...
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