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What is an argument that shows that the emergence of photosynthetic beings was crucial for life to reach the marine surface and later the dry land?
The Ultraviolet radiation from the sun was not disallowed to reach the surface of the primitive earth. Consequently the development of life on dry land or even near the aquatic surface was impracticable. Most likely the first living beings lived submerged in deep water to avoid destruction by solar radiation. Merely after the appearance of photosynthetic beings and the later filling of the atmosphere with oxygen released by them the formation of the atmospheric ozone layer that filters ultraviolet radiation was possible.
Benzathine penicillin given every three weeks as IM injection (1.2 mega units) has given the best results. Oral agents (penicillin V) are given in patients with lower risk of rheum
Of which cells is the nervous tissue constituted? How is the generic function of this tissue related to the characteristics of the main cell type that forms it? The nervous tis
How dietary constituents affecting the calcium absorption? Several dietary constituents have an effect on calcium absorption. The differences in fractional absorption from diff
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Explain the Autonomic neuropathy It leads to dry skin due to decreased sweating. Dryness of the skin leads to cracking which makes entry of infection in to the deeper plane eas
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To study the conditions essential for the germination of seeds:- In the diagram below a having seeds on cotton wool with air, warmth, but no water; b has water, warmth, but no
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