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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 13:30
What is any method of measuring the age of an object or event in years, such as using atomic half-life?
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Biology, 22.06.2019 14:30
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Biology, 22.06.2019 19:30
Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above
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The main source of energy for our planet is/are a) the sun. b) the earth's core. c) greenhouse gases...
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