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.
How reptiles and birds are different regarding the maintenance of the body temperature? Whether birds are rare in Polar Regions?
Where does hematopoiesis take place?
Specify the role of flagellum of the sperm cell? How is it generated?
Whether fecundation in amphibians is external or internal? Also explain whether amphibians are evolutionarily proximal to fishes or to reptiles?
Write down the differentiation between rough and smooth endoplasmic reticulum.
State the autotrophic hypothesis on the origin of life?
Give a brief explanation of cytoplasmic inclusions.
Is there any living being without cell? Illustrate.
Write down the main prophylactic measures against schistosomiasis?
How does photosensitivity in annelids, cnidarians and worms vary from insects, vertebrates and cephalopods?
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