Why are there less organisms as you move up the pyramid?

As we go further along a food chain, there are fewer and fewer consumers. The further along the chain you go, the less food (and hence energy) remains available. In other words, a large mass of living things at the base is required to support a few at the top

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a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.