<span>d. subsistence strategy.</span>
In spermatogenesis,from a single spermatogonia 4 haploid sperms are produced after meiosis (100% efficiency).But in case of oogenesis,from a single oocyte only one is transformed into ovum even after meiotic division(25% efficiency)
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Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much of the carbon dioxide was replaced with oxygen.
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The Calvin cycle is known as the light independent reaction though it is not directly dependent on the light but the requirement of energy carriers ( ATP and NADPH) which is essential for initiation of Calvin cycle is dependent on light.