Which layer of Earth is made up partly of crust and partly of Mantle material?
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Biology, 22.06.2019 12:30
Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled
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Biology, 22.06.2019 17:30
The krebs cycle is also known as the calvin cycle pyruvic acid cycle carbon - oxygen cycle citric acid cycle
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