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.
Explain some morphological features which distinguish the beings of the phylum Annelida from nematodes and platyhelminthes?
How does the nervous system acquire information regarding the external atmosphere, the tissues and organs?
How the gas exchange process is different in reptiles as compared to the amphibians.
Which germ layers present in the cnidarians? Which tissues of animal do they originate?
Write down the function of myelin sheath? Do all axons present the myelin sheath?
Extracellular digestion: It is that digestion in which food breaking into utile molecules which can be internalized by the cell is prepared in the extracellular space, that is, exterior the cell. In extracellular digestion the cells secret substances
Why can the allantois be regarded as an adaptation to terrestrial life?
SARS is a disease which appeared in the year 2003 with epidemic features in the province of Guangdong, in east China. What kind of agent causes the SARS?
Explain the endocrine glands which regulate sexual action in males? What are the involved hormones and how does it regulation work?
Why are vaccines employed in the prevention however not in the treatment of infections? Why can antivenom serums be employed in the prevention and treatment?
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