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on this post you will find 3 reading of IPA terpadu, first reading about rain from nitrogen and fertilizer , second reading about Leptonychotes weddelli (Anjing laut) and the last is about hemoglobin human at hight  place.

The nitrogen cycle represents one of the most important nutrient cycles found in terrestrial ecosystems (Figure 9s-1). Nitrogen is used by living organisms to produce a number of complex organic molecules like amino acids, proteins, and nucleic acids. The store of nitrogen found in the atmosphere, where it exists as a gas (mainly N2), plays an important role for life. This store is about one million times larger than the total nitrogen contained in living organisms. Other major stores of nitrogen include organic matter in soil and the oceans. Despite its abundance in the atmosphere, nitrogen is often the most limiting nutrient for plant growth

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Download soal IPA Terpadu 1998

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