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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
what are the modes of reproduction?
BAER' S LAW - It was given by K.E. Von Baer. Von Baer was the first scientist who studied the embryology systematically. According to it, in the embryonic development of an
Q. Explain Percutaneous Interventions Over the last two decades, significant strides have been made in the field of Balloon Valvuloplasties both in terms of technique as well a
What is Implant Failure Implant Failure : The total failure of implant to fulfil its purpose which are49 Surgical Complications, Long Term Implant Failures and Ma
Natural Colors Used In Foods Natural colourants produced for use in an analogous way to the coal-tar dyes are crude extracts of pigments, which are basically unstable. The appa
Define Guidelines of School Children and Adolescents? 1) Do not skip breakfast. At least have milk, fruit and cereal. Some children prefer to flavour the milk with cereal or pr
control of microorganisms by chemical method.
Q. Which animals make tracheal respiration? Is there a blood-like fluid that participates in this process? Arachnids and Insects are the arthropod animals that make tracheal re
what is the mode of nutrition in cow
Megasporogenesis One of the nucellar cells situated subjacent to the epidermis differentiates into the primary archesporial cell. This cell is larger than the adjacent ce
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