Abundancy of oxygen in the atmosphere
Whether there was molecular oxygen within the earth's primitive atmosphere? How that molecule has become abundant?
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The existent of the molecular oxygen within the primitive atmosphere was probably at the minimum and extremely rare. Oxygen form abundant gas due to the emergence of photosynthetic beings, around, 1.5 billion years after appearance of the life over planet.
Name the chemical substances which compose the plasma membrane?
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After neurula stage and from its ventral portion to dorsal how the morphology of the embryo can be explained?
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