Nucleus, that is the answer
The answer for this qn is D.
This is a flase statment. I know for a fact because I put true and got it wrong.
A good answer would be "caste". A caste system is the social hierarchy in India in which people are first assigned one of the four main castes (scholars, warriors, farmers, servers) and then additionally often also to smaller castes (farmers of rice, of bananas). The social mobility is very low.
Sediment on the seafloor originates from a variety of sources, including <span>biota </span><span>from the overlying ocean water, </span>eroded<span> material from land transported to the ocean by rivers or wind, ash from volcanoes, and chemical </span><span>precipitates </span><span>derived directly from sea water. A very small amount of it even originates as </span><span>interstellar </span>dust. In short, the particles found in sediment on the seafloor vary considerably in composition and record a complex interplay of processes that have acted to form, transport, and preserve them.<span>
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