Prithibi ko jalghraha kiu kaha jata hai
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The Earth is the only celestial object known as the liquid water bodies on its surface, although several exoplanets have been found with the correct conditions to support liquid water. [Op] For exoplanets, current technology cannot directly observe liquid surface water, so atmospheric water vapor can be used as a proxy. The world of oceans — or oceanic planets — provides clues to the growth and development of the solar system in its history and overall. Of additional interest is their ability to generate and host life.

the answer to your question is sperm

the answer is b.) hydrogen bonds between bases.