Biology

Biology, 22.07.2019 07:00, louiecampos

The absence of in the primitive atmosphere was essential to the origin of life on earth. n2 co2 ch4 o2

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Biology, 24.08.2019 03:30, calraezaj2020

The earliest organisms were completely heterotrophic in nature. why? a. the primitive atmosphere lacked sunlight. primitive organisms did not have a system complex enough to use for other sources for photosynthesis. b. the primitive atmosphere lacked oxygen. primitive organisms did not have a way to break down the oxygen in water. c. the primitive atmosphere lacked carbon dioxide. primitive organisms did not have a way to obtain carbon dioxide for photosynthesis.

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Physics, 30.08.2019 23:10, martymangaroo

Where does the atmosphere of the earth end? (i.e. where is the top of the earth's atmosphere? ) where does the atmosphere of the earth end? (i.e. where is the top of the earth's atmosphere? ) a. the tops of thunderstorms are at the top of the earth's atmosphere. b. there is no definite top to the atmosphere. the pressure and density gradually get smaller as the altitude gets larger. c. the top of the earth's atmosphere is about 100 kilometers below the orbit of the international space station. d. the earth's atmosphere ends at the point where the aurora (northern lights) begin.

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Biology, 10.10.2019 19:00, poohnia

By discharging electric sparks into a laboratory chamber atmosphere that consisted of water vapor, hydrogen gas, methane, and ammonia, stanley miller obtained data that showed that a number of organic molecules, including many amino acids, could be synthesized. miller was attempting to model early earth conditions as understood in the 1950s. the results of miller's experiments best support which of the following hypotheses? (a) the molecules essential to life today did not exist at the time earth was first formed. (b) the molecules essential to life today could not have been carried to the primordial earth by a comet or meteorite. (c) the molecules essential to life today could have formed under early earth conditions. (d) the molecules essential to life today were initially self- replicating proteins that were synthesized approximately four billion years ago.

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Biology, 07.11.2019 19:31, bjbass899

Which of the following statements accurately explains how earth’s atmosphere supports life? a. earth’s atmosphere contains 78 percent oxygen, which is essential for life. b. earth’s atmosphere contains 21 percent oxygen, which many life forms need to survive. c. earth’s atmosphere contains more oxygen than carbon dioxide. d. earth’s atmosphere contains carbon dioxide, which all life forms breathe in.

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