EVOLUTION
THE ORIGIN OF LIFE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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false
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Detailed explanation-1: -The early atmosphere contained ammonia, methane, water vapor, and carbon dioxide, but only a trace of oxygen. As the atmosphere became denser, clouds formed and rain fell. Water from rain (and perhaps also from comets and asteroids that stuck Earth) eventually formed oceans.
Detailed explanation-2: -The early atmosphere It is believed that there was intense volcanic activity for the first billion years of the Earth’s existence. Its early atmosphere was probably formed from the gases given out by volcanoes. The greatest proportion of volcanic gases are made up of carbon dioxide, water vapour and ammonia.
Detailed explanation-3: -They concluded that Earth’s early atmosphere contained CH4, H2, H2O, N2, and NH3, similar to the gas mixtures used in the Miller–Urey synthesis of organic compounds. Illustrative results from calculations of this type are shown in Figure 1.
Detailed explanation-4: -For decades, scientists believed that the atmosphere of early Earth was highly reduced, meaning that oxygen was greatly limited. Such oxygen-poor conditions would have resulted in an atmosphere filled with noxious methane, carbon monoxide, hydrogen sulfide, and ammonia.