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.
Determine the number of cells which are made after meiosis I and meiosis II?
Give a brief introduction of the term ‘pathogens’. And also Name some kinds of pathogens?
Name the organs of body part of the human digestive system?
How is excretion executed in amphibians?
Give a brief explanation of deplasmolysis of the plant cells.
The burden of a tax is shared through producers and consumers. Under what conditions will consumers pay most of the tax? Under what circumstances will producers pay most of it? What determines the share of a subsidy which benefits consumers?T
Name the germ layers existed in cnidarians? In which tissues of animal do they originate?
Write down the similarities and differentiations between the transcription procedure and the replication procedures?
Write down the main natural plant hormones and what are their particular effects?
Explain the DNA ligases? How do these enzymes participate within the recombinant DNA technology?
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