Physical elements at time of origin of life
Specify the physical elements which have contributed to the great amount of the available energy over the primitive earth during the time of origin of life?
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3.5 billion years ago, water cycle was faster than today, resulting in hard storms having the intense electrical discharges. There was also no chemical protection from ozone layer against the ultraviolet radiation. The temperatures within the atmosphere and over the planet surface were very high. Electricity, radiation and the heat constitutes the large available energy sources.
Give a brief explanation of the term anoxia.
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Name the type of circulatory system in molluscs? How can it be contrasted to respiratory system of the annelids?
Explain the term mechanical digestion? In arthropods, molluscs, earthworms, birds and vertebrates, in common, which organs correspondingly participate in this kind of digestion?
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